Mathew Kevin


When we mention about smart thermostats, NEST and ECOBEE are the two names that pop up in our minds. Even with their splendid design and the lucrative features tailored for complete comfort, they come at a cost that is sure to burn your pockets.

Needless to say, their high price makes us think twice before investing a hefty amount on them. Hence, companies thrive to manufacture affordable alternatives to these thermostats. The LUX GEO WH Wi-Fi  is one such smart thermostat model.

LUX Product Corporation, on June 22, 2015 released on of its smart thermostat model, which had almost every smart feature and would fit in to a decent budget range.  Being true to their philosophy of designing products that ensure comfort and easy access, this thermostat will not disappoint you.

With the price it comes, it has various features which make it no less than a smart thermostat.

The Wi-Fi enabled LUX/GEO thermostat is the first of its kind to be truly powered by batteries. You can choose which power source you need for your LUX/GEO thermostat. You can either use batteries or use the C-wire to get power directly from the source or even use a micro-USB cord to power up this thermostat. If you use the C-wire or USB to power up, this thermostat can be used with Amazon Alexa enabled devices too.  

This 7 day programmable smart thermostat gives you 2 options: either set 2 periods for a day or set 4 periods for a day. This gives the flexibility to program the schedule in our way. The dial placed on the front is used to change the set temperature.

The LUX/GEO thermostat can be used to control the HVAC systems like Conventional heat & A/C up to 2-stage heat/2-stage cool, heat pumps with up to 2-stage heat/2-stage cool (including aux/emergency heat),3-wire heat only hydronic systems (hot water, baseboard and radiator)and Gas millivolt heater. It cannot be used for line voltage heaters like an electric baseboard.

The geo fencing feature of LUX GEO thermostat is another of its main feature that sets it apart from its high priced competitors. This feature tremendously helps to reduce the energy consumption in the long run.  

This was a brief overview of LUX GEO thermostat, let us dig deep into its various features.


When you compare the LUX GEO thermostat with the Nest Learning and Ecobee 3, you may not like the look of it. It is rectangle in shape with 5.8(W) x1.5(D) x 3(H) inches and looks like a basic thermostat. One good thing is that it can be mounted in any way, either horizontally or vertically. It has a 2 x 2-inch LCD display on one side and the other side has a 2 inch diameter dial. The dial side is rounded off at the edges. The thermostat thickness is about 1.5 inches and this means it will project a bit more than a normal thermostat.

This model gives you the option to choose between its two finishes. One is white with pearl chrome accent and the other one is black with black chrome accent. It is one of those few wi-fi enabled thermostats that give you such choices!


The 2 x 2-inch LCD display of the LUX GEO thermostat is quite large and displays all the vital information. The LCD screen is backlit, so you have visibility at all times. You can control how long the screen needs to stay lit. It can either stay all day long or just automatically turn off after 5-15 seconds.

The interface kind of looks like an old school model with the large, blocky, black and white fonts used to display the information on its LCD screen.   You can make selections on screen using the dial. It is simple to use and hence the temperature settings can be changed by anyone.

The display prompts whether the thermostat is being used with a heating or cooling device, the room temperature, the set temperature, the date, whether the wi-fi is connected or not, among many other things. You can navigate through its settings and learn a lot more.

Program and control options

Since this is a programmable thermostat, and not a self learning thermostat, you will have to program the temperatures, which is good, if you do not have a fixed routine.

It gives you the liberty to choose whether you want it for heating or cooling. Also, if you select the auto mode, it will automatically toggle between cooling and heating systems, once you have set the appropriate temperatures.

Also, for each day you can schedule temperatures for either 2 periods or 4 periods.

The round dial does the selection for you. You will have to press at the top of the dial to select the desired option from the menu. In case you want to go back to the menu, press at the bottom of the wheel.

The control can also be done remotely, when the Wi-Fi is enabled. You will have to install the LUX  GEO app on your android/iOS device to completely control the thermostat from virtually anywhere.

This means even if you are away, you can set the schedule in a way that you get to enter into a cosy home, after a long tiring day.  

You can also lock the temperature settings, such that it is free from wandering and unauthorized hands. The LUX GEO app has a collection of energy profiles to choose from, so that you program and control the thermostat in the most economical manner.

Once the Wi-Fi is enabled, you can control multiple LUX Geo thermostats installed at different rooms in your house through the APP itself.

There is also an option to control LUX GEOS installed in different houses, through the APP.

This control feature is great, if you are a constant traveller.

Geofencing feature

LUX GEO, as you can guess from the name itself boasts of the one of the newest feature trending in the market and that is the geo fencing feature.

Geo fencing feature lets you choose a virtual fence around your house. The thermostat here is connected to your phone or tablet through Wi-Fi, then when you(that is your phone) moves away out of this fence, the thermostat turns up the AC or heater to a more energy efficient temperature.

This is a great one, especially when you have random in and out schedules. It avoids reprogramming every time you enter the house.

In case, you do not need this feature, there is an option to disable it also. This is what makes this thermostat so flexible in its operation. You can personalise the settings according to your needs and convenience.


This thermostat is ideal for a HVAC unit like Conventional heat & A/C up to 2-stage heat/2-stage cool, heat pumps with up to 2-stage heat/2-stage cool (including aux/emergency heat),3-wire heat only hydronic systems (hot water, baseboard and radiator)and Gas millivolt heater.

However, if you want a smart thermostat for your eat pump with (Y2) two compressor stages or a line voltage heating systems (120/240) like an electric baseboard, LUX GEO is NOT for you.


 The LUX GEO thermostat has a bi-directional mounting design. This enables to install it either horizontally or vertically. It also comes with a 24V C-wire, which can be used for powering it up. You can also install this thermostat without the C-wire. This thermostat’s installation process is a bit different from its NEST and ECOBEE counterparts, where you only have to  insert the wires to their respective slots. Here while installing the LUX GEO, the wires need to be screwed to their respective places.

Other than that the installation process is quite basic and can be done easily by following the installation guide that comes with this product.

Power Source

One of the main highlights of this thermostat is its ability to power up fully using only 2 AA batteries. It can be powered up by any of the three methods, which include: battery source, direct line source through 24V C-wire and a USB micro plug.

So even if you do not have the provision to install the unit with the C wire, you always have the option to power it up with 2 AA batteries.


With all the features it possess, it is almost like a smart thermostat. The only thing missing is a touch-screen display.

For all its features, the price is quite reasonable when you compare it with the high end smart thermostat producers like the NEST and ECOBEE.

Go for it, if you want a smart thermostat in a reasonable price.

Quick Overview:

Let us now discuss the pros and cons of the LUX GEO Thermostat briefly to conclude the article.


  • Geo fencing
  • Reasonable price
  • Simple design and easy to use interface
  • Wi-Fi enabled
  • Can be controlled through LUX GEO app on you Android/iOS device
  • Energy settings suggested to minimize the energy bill
  • Available in 2 colour finish
  • 7 day programming with the flexibility to program either 2 or 4 periods per day.


  • Does not support many home automation hub like IFTT
  • Amazon Alexa is enabled only when the C-wire is used.
  • The black and white, blocky font n the LCD display looks outdated

All in all, the LUX GEO gives you the luxury of a smart thermostat without giving you a hole in your pocket

“LUX TX100E – Customisable, Simple, Efficient 7 Day Programmable Thermostat”

LUX, the Philadelphia based product company, is one of those leading thermostat providers which produce quality products under a decent budget. They have wide range of thermostat models in market from a basic thermostat to a high end smart thermostat.

Here, we discuss the TX 100 model, which is a programmable low voltage thermostat from the house of LUX.

This 7 day programmable thermostat is highly customizable and very easy to use. It can be programmed for a straight 7days of the week or can be programmed differently for 5 weekdays and 2 weekends. Not only you can program the temperature schedule, you can also program the configuration of this thermostat. This makes it highly customizable for the operation.

TX 100 is designed to be used for low voltage(24V)heating and cooling systems. It has a sleek body with easy to use push buttons to select the temperature and other features from the menu on its LCD screen.

You will be free from the clicking noises while the thermostat turns on/off, it performs silently. The attractive, mercury free design is no rocket science to use. It is designed in a way which can be operated by anyone.

It also provides temporary override and manual hold option which gives you the flexibility to change the preset temperature, in case there is a change in your schedule.

Another great feature of this thermostat is that it provides the freedom to adjust the heating and cooling requirements. There is slide up/down button on its front panel that serves the purpose of selecting the heating cooling options.

This was just an overview of what to expect from this thermostat in brief. To know more about its features, read on.


The TX 100E thermostat has a dimension of 1.1×5.4×3.4 inches and weighs around 8 pounds. It has an attractive, mercury free design which is not only environment friendly but also looks good on any wall. It has control buttons on its front panel which include push button and slide button.

The set, next, hold and up/down push buttons have been placed for control of software settings. The slide buttons have been given to control the blower fan and the heating cooling system.

The heating/cooling system can be turned off by sliding the button to the “off” position. While using the thermostat for heating, you can choose the heating option. Same is for the cooling system.

This control panel is easy to use and understand, hence can be operated by anyone without much effort. The LCD screen displays all the vital information and acts as an interface while programming.


Since, the LCD screen plays an important role while programming, it needs to be easily read and understood. The TX100E thermostat’s LCD screen is big enough to ensemble all the important information. It shows the mode, the ambient temperature, time and date. If you want to view the set temperature, simply press the up/down button.

You can change the menu settings, through the menu options displayed on the screen when either of the set/next buttons are pressed. You can also choose which temperature format needs to be displayed: either Fahrenheit or Celsius.

The interface is clear and can be read in all lighting conditions. This is because the screen gets illuminated for 10 seconds when any of the buttons are pressed. If any one of the buttons are pressed again while the backlight is on, then the screen will be illuminated for additional 10 seconds.

Programming options

LUX TX100E thermostats provides 2 programming styles to choose from. One is weekday-weekend (5-2)programming style and the other one is an individual routine for each day of the week (7 day programming). You can also choose not to program a schedule by using the manual mode of the thermostat. Here, the thermostat will not follow any routine ad maintain the temperature at the set temperature until it is changed manually using the up/down buttons.

By default, this thermostat uses 4 periods for each day. However, you can change to 2 periods per day as well, according to your convenience. Also, if you feel like changing the temperature setting while the thermostat is working, you need not reprogram the whole schedule again. For this, the temperature override option has been given. It sets the temperature to a new value, while the thermostat is still on.  

There is also the option to copy a day’s setting to set the schedule for another day. This saves a lot of time in setting a schedule for days which need similar programs.

In any case, you need the feel to hold a temperature at a set value but want to follow a routine also, and then you can use the temperature hold button. Here, the temperature will be held at a particular value for indefinite time, as long as it is released.

Since, this thermostat can be used for heating and cooling system, it provides the option to program for both these systems separately.

Another remarkable feature of this thermostat is that, not only can you program the temperature settings but also can do it for calibration settings. Any case, if you feel the results are not accurate and calibration needs to be changed, then you can adjust the room temperature measurement to as low as subtracting 5 degrees to as high as adding 5 degrees Fahrenheit.


TX100E thermostat from LUX is a low voltage thermostat and is designed to work with single stage heating system only. It can be used with a fan blower system only if the “G” wire is used.

It is compatible with: gas, oil, electric or single stage heat pump systems, 2-wire heat-only hydronic systems (hot water baseboard and radiator), Millivolt systems (wall heaters/furnaces and gas fireplaces)

It is not compatible with:  Multi-stage heat pumps, 3-wire hydronic zone valve systems and Line voltage systems (120/240 VAC)


This thermostat can be installed with 2 or 3 wires. In case you need to control the fan blower, you must install the “G” wire.

Installation process has been given in detail in the operation manual of the thermostat. It is advisable to hire a professional help for the same, if you are not quite familiar with the home wiring techniques.

Power Source

TX 100E is a dual powered thermostat. This means it can either be powered using 2 AA batteries or can be directly powered through the 24V system.

Miscellaneous features

  • No clicking sound while turning on/off. Fully silent operation makes it suitable to be placed in any room.
  • The configurable temperature swing value gives you the flexible to adjust how much the temperature can be allowed to “swing” before the thermostat starts it operation.
  • Keep it safe from the unauthorized hands by locking the keypad.

These were the main features of the TX100E programmable thermostat in detail. Let us now conclude by listing out the pros and cons of the product.


  • Backlit display
  • Option to turn off the heating/cooling system
  • Silent operation
  • Adjustable temperature swing and calliberation
  • Accurate room temperature sensor
  • Easy to program
  • Dual powered
  • 7 day or 5-2 Day programming


  • Cannot be used for multi stage heating/cooling systems
  • Not compatible with electric line heaters

For so long until 2017, a proper smart thermostat was not available for baseboard heaters and line voltage based heating systems.  In 2017, Mysa thermostat was launched in the market – which is a smart thermostat exclusively designed for line voltage heating systems like baseboard heaters, fan forced heaters, convectors and for radiant ceiling heaters.

Mysa comes packed with a lot of smart features like WiFi connectivity, internet based control using apps, voice control by interfacing to smart home hubs (Alexa, Homekit, Google Home etc), energy reports and a lot more. 

Thermostats were really “old school” till 2011, and many households were using a simple digital programmable or manual thermostat variant. A revolution was started when Nest labs first introduced smart thermostats in 2011. Since then, lots of new smart and internet connected models like Ecobee, Honeywell RTH9585WF, and Emerson Sensi has gained popularity.

The birth of Mysa Thermostat

All those new smart & wifi enabled thermostats were low voltage thermostat models suitable for central furnaces, heat pumps and central boiler systems. No innovation was happening in thermostats for line volt systems like baseboard heaters until 2017, when Empowered Homes Ltd (headquartered in Canada) put an end to this by launching its  innovative smart thermostat Mysa for line volt systems.

Mysa smart thermostat
Mysa Thermostat and App

In a nutshell, Mysa is currently the best WiFi enabled smart thermostat for line voltage systems, which can be controlled via internet, has a user friendly mobile app, can be interfaced to smart home hubs for voice control, and is compatible with 120/240 volts, delivering a max output power of 3800 watts at 16 amps current.

Check Price & View Details

This beautifully designed 5.7 inches tall, 3.8 inches wide, 1.1 inches thick thermostat comes in soft white rectangular box type structure. This sleek design blends well with any wallpaper/interior theme and gives a stylish, elegant look to your wall.

The subtle LED light on its surface shows the set room temperature and two up/down arrows for temperature control. The controller inside is cooled by the heat sink that adds to the big size of this thermostat.   

This unit is compatible with the 110V, 120V, 208V, 220V and 240V line heating systems like the electric baseboards and supports load up to 3800 Watts. 

In order to control the device remotely, you will need to first install the device and then set up the app on your phone.  The app works in both android and iOS devices, and allows you to set up customized comfort literally from anywhere.

Mysa Thermostat Review
Mysa Thermostat App

The device has self learning abilities and learns your schedule to give better suggestion for comfort and energy savings. Unlike Nest (which automatically creates a schedule & improves upon), Mysa uses machine learning to improve upon a schedule that is already set by you initially. 

What makes MySa smart thermostat different?

One of the major problems that some of the smart thermostats faced was the lack of proper connectivity and the need for a third party hub. MYSA thermostat has been designed to overcome these issues.

It has relatively good wi-fi connectivity and the MYSA app is also quite user friendly. You need not be a tech guru, to use this app.

Also it works with the popular smart home hubs like Amazon Alexa, Apple HomeKit, IFTTT etc. This means you need not require to install any third party hubs.

Therefore, if all you want in a smart thermostat is that it should work well with its wi-fi connections, MYSA thermostat is the right choice for you.


The Mysa thermostat sports a sleek, modern, yet minimalist rectangular design. It looks like a small white box which may seem a bit thick. It adds to the style quotient of your modern home.  

The display shows current room temperature and two arrows (up/down) to change the temperature setting on device. Temperature and the arrows are displayed using LED, which resembles the dotted displays of the past with a modern outlook. The display is capacitive touchscreen, and the UP/DOWN arrows can be touched to increase or decrease the temperature setting. 

Mysa is a little bulkier in build and the thickness is due to the big heat sink used to cool off the Triac based switching IC. Many conventional thermostats uses relay based switching which is inefficient compared to triac switching. Though the use of triac makes the device bulkier, it gives significant benefits in terms of faster switching, higher efficiency and energy savings. 

The brightness of the display can be adjusted through the mysa app. It can be turned completely off or set to a light in the 10- 100 percent brightness range. It is wired directly to the power supply and hence discards the need of using batteries.

Next thing, which makes a thermostat smart, is its in built sensors. Let us see what this thermostat has to offer in regard to its sensors.


If we talk about its in-built sensors, then it is embedded with humidity and temperature sensors. These predict the amount of humidity and temperature of your room. It reflects the measured value on its screen, through a subtle LED light. This helps the thermostat to maintain the temperature of the room.

When the temperature sensor measures the room temperature to a value, which is far from the set value, the thermostat works at a high power. This power is reduced as the room temperature approaches the set value.

The display shows how much power is being used by the thermostat. A single small flame indicates low energy consumption, while 3 small flames indicate highest energy consumption.

The one drawback with this model is that it lacks motion sensor. This effectively means that it does not offer any native geo fencing feature, which is one of the helpful tools in reducing the energy usage.

Talking about the remote sensors, it senses the outside temperature when integrated with the smart hub like IFTTT through the MYSA app on your phone.

Sensor Specs

Temperature Precision: +/- 0.4 F / 0.1 ℃
Humidity: +/- 2%
Control Range: Complete Off, 5-30 ℃

Customised Comfort

MYSA can be controlled from anywhere through its app on any android/iOS device. You can set the temperature and schedule according to your routine, easily through this app. You can set up to a total of 56 temperature set points for the whole week. This means that, if you spread the temperature set points evenly over the week, you can set up to 8 temperature values a day.

You can create zones in your home, by using two or more thermostat which needs to work on same schedule, through the MYSA app. You can create your customized schedule and save it for future. Also, if you have a fixed routine, the MYSA thermostat learns it and implements it accordingly.  Your thermostat will work according to your schedule, and deliver its best performance. In case you need to change the temperature in a particular zone, you can use the “Hold indefinitely” option. This overrides the set temperature to the new value.

Energy Saver

When you invest in such a high priced smart thermostat, you need to know if its worth the price. A smart thermostat is placed in your smart home, to help you save energy in a smart way. So, you have to choose a thermostat which would help you for the same.

How this smart thermostat aids in saving the energy? Well. it generates real time energy usage reports which lets you check where and how much energy is being wasted. This helps you in generating an optimal schedule that not only suits your life style, but also your pocket.

Another cool feature is its easy to activate, vacation mode. If you are going away on a vacation, then set the vacation mode on. The thermostat will work accordingly.

There is also an option to cut off the supply between the thermostat and the heater. This means, you can use the thermostat only when it is needed.

The MYSA app also estimates how much energy bill you will have to pay, according to the energy usage.

Compatibility & Tech Specs

MySa is a line voltage/high voltage thermostat that works with 110 volt or 220 volt systems. 

MySa thermostat is compatible with most of the line voltage heating systems like:

  • Electric baseboard heater,
  • Convectors (short cycle),
  • Fan-forced convectors (long-cycle),
  • Radiant ceiling heating
  • Self-contained hydronic baseboards.

Note: MySa thermostat can not be used with low voltage systems like Central furnace based systems, boiler heating systems, heat pumps or any other system that comes under low voltage operation.  

Electrical Ratings
  • Output – up to 3,800 Watts (maximum)
  • Voltage – 120V / 240V AC
  • Max Current – 16 Amperes 

MySa Installation

First of all, MySa is a high voltage/line voltage thermostat. If you don’t have prior experience in handling electrical wiring, you should not try to install a line voltage thermostat yourself. You’d be better off calling a qualified electrical technician to do the installation for you.  Otherwise, if you have enough basic technical knowledge about electrical systems, and if you’ve done some electrical installations before, you can easily install a MySa thermostat following the well explained installation guide.

MySa has published a demo installation video in Youtube. You may watch if you want to get an idea of MySa thermostat installation.

The beautiful hardware features accompanied with the basic smart thermostat features makes this thermostat a good choice. Before wrapping up this review, here are the pros and cons of the product listed briefly.


  • Sleek, robust design
  • Reliable wireless connectivity
  • Temperature and humidity sensors with high precision
  • Schedule up to 56 temperature points, that is around 8 temperature set points for each day
  • Works really well and in sync with popular smart home hubs like the Apple Homekit, Google Home, Amazon Alexa and IFTTT.
  • Voice control via smart home hubs.
  • Use of TRIAC Integrated circuit instead of a relay helps the thermostat to heat up at different intensities, which in turn increases the thermostat efficiency
  • Energy usage reports available in mobile app helps in proper energy use monitoring and save energy by taking necessary action.
  • Quick set of the vacation mode
  • Supports multi zone feature


  • Lack of motion sensor.
  • No native Geofencing, which is quite useful in reducing the energy consumption.
  • Does not support Samsung smartthings hub as of now.
  • Use of large heat sink for the TRAIC IC makes the product thick and bulky.

To wrap up, MySa is currently the best line voltage thermostat with WiFi feature for systems like baseboard heaters. If you’re serious about WiFi feature, you should not look beyond MySa as its wireless connectivity is very reliable. Also, there are not many choices for line volt thermostats with WiFi feature and a well designed mobile application. Though there are models like Stelpro KI, they require third party hubs like an Z wave controller to connect to home WiFi network or internet. And the mobile app for Stelpro model is substandard. Overall, MySa is really a winner & the best choice (if you’ve enough budget) as a modern, smart line voltage thermostat.

One of the main concerns while installing a HVAC system at our homes is the amount of energy it consumes. To make the optimal utilization of the heating/cooling systems, thermostats need to be installed. However, even if we love the smart thermostats from the leading NEST, ECOBEE brands, their price tag may seem heavy for you when you are on a tight budget.

Nevertheless, companies like the LUX products, thrive to produce an affordable thermostat without compromising much on its quality. One such product from this manufacturer is the LUX TX9600TS.

It is a 7 day programmable thermostat and is compatible with almost every heating and cooling unit. The large, touch-screen digital display adds to the elegant look of this unit. It has two small sliding switches for fan control and to turn on/off the heating/cooling system.

Another remarkable feature of this unit from LUX is the flexibility to choose the number of periods per day. You can choose either 2 periods or 4 periods programming for a day. Each day of the week can have different schedule, according to your routine.

You can always switch to the non programmable mode in this thermostat, where you can set the temperature manually. The thermostat will continue to work at this temperature, unless it is programmed at a different set value.

The programmable touch screen has a lock option, which prevents it from unwanted changes through wandering hands. Also, the temperature override and temperature manual hold option amplify the versatile nature of this unit.

The temperature format can be switched between Fahrenheit and Celsius by selecting appropriate option from the user friendly menu. There is an optional recovery feature too, which aims to reach the set value of the temperature at the scheduled time by changing the temperature setting early.

Let us dig deep and learn more about its features.


One of the things which we have in the back of our mind, while shopping for a thermostat is its look. We tend to go for models with an elegant look which would exemplify the beauty of the inner walls of our home.

The LUX TX9600TS may fall into a medium budget category, but it does not compromise on its look and style. It blends with any wall and adds charm to your home while providing the comfort you need. It comes in a 5.4×1.1×3.4 inches rectangle shaped unit. It has a large, touch-screen digital display, right on its front and two slide-push buttons on its side.  One of the switches is provided to control the blower fan and the other is to select the system mode.

Overall the thermostat is designed to give the user easy to access features and hence can be considered user-friendly


As already mentioned, LUX TX9600TS sports a digital, large touch-screen display. The display interface gives quick, clear information about the temperature, day, date and other vital system information.  The easy to read display comes with a backlight to assist you in viewing in dark, dim lighting conditions.

The backlight is activated for 10 sec, once you tap anywhere on the screen. Also, this time is extended for the next 10 seconds, if you tap on the screen while the backlight is on.

The top most portion of the display shows whether the thermostat is being utilized for heating or cooling. If the heat system is working, you will see small flame like icon, and if the cooling system is on, you will see snowflake icon there. This assists you in monitoring your HVAC system.

Programming & Operation

The LUX TX9600TS gives you the option to program a different schedule for each of the 7 days of the week. Also, you can select whether you want 2 or 4 periods for a day. This benefits the users, with no fixed routine.

This thermostat has 2 control slide switches, which enhances it usability.

The upper switch is the fan mode switch and has 2 options: Auto mode and On mode. When the “auto mode” is selected, the thermostat will automatically turn on and off the blower fan according to the needs. When the “on mode” is selected, the blower will be turned on continuously.

Auto mode is preferable as it optimizes the energy usage.

The lower switch is to control the system settings. It has three options: Off, heat, cold.
“OFF”– Turns off the HVAC system, “Heat”- Turns on the heating system, “Cold” Turns on the cooling system.

Another useful option provided by this manufacturer’s unit, is the temperature override and temperature manual hold. It lets you change the set temperature at anytime. Also, the emergency heat option is a great plus for those with heat pump configuration. It prevents the heat pump to waste energy, in case the outside temperature dips drastically. When in emergency heat mode, the display will show “Emer Heat” instead of “Heat mode”.

The system menu offers numerous options which, when used to program a schedule properly can save a lot of energy being wasted.

In case you need the thermostat to follow a same routine for more than one day, you can make use of the program copy feature. This allows you to copy a schedule from one day to another day, without the need to create a separate program schedule.

This unit has adjustable temperature swings, the minimum temperature swing being +/-0.25°F, which is fine to produce accurate results and good functioning. This swing can be altered when needed. Another unique feature is its adjustable temperature offset and energy usage monitor.  


While buying a thermostat to replace an old one, or even for a new home, one thing that bothers is its installation process.

Installation for this thermostat has been well explained by videos on Youtube and also in its installation guide. If you are familiar with home wiring, you can carry it yourself, using these aids.

One thing, though which might look like a problem is that you need to take off the back for the installation. For this you need to use the second of the three flaps given on its top. You have to oush it back from the other two flaps and it will flip open.

If your heating system has a blower fan, you will need to connect it to the “C” wire. Only then can you switch the blower on/off.


Even though the manufacturers boast this thermostat to be “universal compatible” thermostat, this does not work with certain heating systems like:
Line voltage electric baseboard heater and two stage cooling systems

Other than this it is compatible with almost all other North American heating and single stage cooling systems which include: two stage heat/ one stage cool (gas, oil, electric, or single stage heat pump systems, two wire heat only hydronic systems (hot water baseboard & radiator) and millivolt systems (wall heaters, furnaces & gas fireplaces).

Power Source

This thermostat can be powered in three ways. One way is to power it up with the 24 voltage AC alone , the second way is to power it up with only batteries(2 AA alkaline) and the third one is to power it up partially by 24 V AC and the batteries.

The thermostat works better when powered by batteries alone. You can program it even when it is taken off the wall, if powered by batteries alone.

Now that the basic features have been discussed, let us have a look at its pros and cons:


  • Adjustable programming for each day of the week
  • Choice of 2 or 4 periods for a day
  • Adjustable temperature swings
  • Dual powered(both battery operated and 24 volt AC operated)
  • Easy to read, backlit large display
  • System turn off option
  • Blower fan control option
  • Program copy function
  • Compatible with almost all multi stage heating and single stage cooling system


  • It cannot be used for electric baseboard heaters and multi stage cooling systems
  • Works better when operated with batteries

In a nutshell, LUX TX9600TS feature packed thermostat and one of the good options available in the market for its price.

Ever since thermostats have been serving the mankind, it has undergone numerous makeovers in terms of its shape and features. As we tend to create a smarter home, with each passing year, the add on features available are plenty. Now the thermostats not just control the temperatures control the temperatures by themselves, but are smart enough to save you great bucks in terms of energy bills.

Although these add ons have made life simpler in terms of the output they produce, it is quite tiresome to learn the new technology and the associated programming, for a common person.  Also, the budget needed to buy these high end thermostats may burn your pockets.

Therefore, there are some of us who still like the good old manual thermostat models, which are still untouched by the new generation digitalization wave.

They are simple to use and very light on the pockets. One such popular manual thermostat model is the Honeywell’s manual double pole premium YCT410B1000/U model. These are line volt thermostats and come in single pole variant as well. The Honeywell T410A1013 is its single pole model variant.

This article describes the features and operation of this Honeywell manual thermostat.

If you are buying a thermostat for the first time, then you must be wondering what do the single pole and double pole terms signify.

Basic difference between single pole and double pole thermostats

A single pole or 2 wire thermostat, keeps the heater on at a minimum set temperature at all times. It does not cut off the heater completely from the power source. This may pose some safety concerns in the case where temperature dips suddenly in your absence.

If the temperature goes below the set minimal temperature, the heater gets turned on automatically. If this happens when you are on a vacation with things lying near to the heater, a serious fire mishap may occur.

A double pole or a 4 wire thermostat, on the other hand, has a “turn off “ option wherein, the heater is turned off completely. This makes this model more reliable and hence is more popular among the consumers.

If we talk about the Honeywell manual thermostat, its double pole variant is more popular than its single pole variant, even when almost all its features are quite similar.

This thermostat is ideal for a line voltage baseboard heater and is rated at 120 – 240V ,5280 Watts.

The single knob controller makes it super easy to use. The installation manual guides through the installation of this product to make the process a breeze.

Let us dig deep into more of its features.

Basic Design

The 2.2 x 2.8 x 4.5 inches rectangle shaped thermostat from the house of Honeywell has a very basic box like design. The front panel has a dial to set the temperature at the desired value. The thermostat design goes well with any wall and kind of looks like an old school fan regulator.

The mounting base is made of rugged plastic which makes it robust. It has a single cover and has vents on both top and bottom. The temperature is displayed in Fahrenheit, in both the variants of the thermostat. You need to handle the product carefully, mishandling or extra pressure on the know, may damage the dial and sensor.

The temperature range over which this thermostat controls is 50C to 250C.

The only difference in design between the two variants is that the leftmost position in the single pole thermostat indicates the minimum temperature that can be set, while the leftmost position in the double pole thermostat is marked “off”. The “off” mark indicates that the heater is turned off.

Bi metallic temperature Sensor

The accuracy of this thermostat owes to its bi metallic temperature sensor. This sensor uses the two fundamental properties of a metal: the thermal expansion and the temperature coefficient. Here two thin metallic strips are bonded together in a way that there is no motion between them.

This basic sensor is less expensive and is one of the reasons behind the low cost of this manual Honeywell thermostat.

This sensor works well to sense the high temperatures; however it may not generate accurate result at low temperatures. The accuracy of this thermostat is found to be +/-5 degrees.


The operation of a manual thermostat is the simplest. You are free from the hassles of programming the desired room temperature and there are no issues of memory outage. All you need to do is turn the knob to the desired temperature level.

If you intend to use the single pole variant, be sure of keeping your valuables away from the heater. The heater gets heated up unexpectedly with a sudden temperature dip. This poses serious safety concerns if not monitored properly.

The double pole variant has no such issues, you can turn off the heater when not required and set the temperature when heating is needed.

If the thermostat is used for the first time, it is recommended to set the temperature at 20oC and check whether the heating done is satisfactory. If you do not get a satisfactory output even after 2 hours, try setting the knob to increase or decrease the temperature as required.


The line Manual thermostat from the house of Honeywell can be used for the temperature control of a radiant cable, electric baseboard and resistive rated fan forced heaters within the ratings: 22A at 120/240, 5280Watts.

This cannot be used for inductive loads like contactor/relay.

Low on maintenance

This Honeywell’s thermostat needs limited care. It comes with a trouble shooting guide, which explains all the possible problems that may occur along with the remedies.

Like for example if there is an issue with the heating, the guide will help you understand the cause and look for a suitable solution.


The installation is quite easy and effective. You will need to read all the instructions carefully and follow them to get the best results. If your heater has been inoperative for a long period of time, ensure that the heating system is in working condition before installing this device.

Check the thermostat before using it, by turning the heater on first and then turning the thermostat knob fully towards left and then right. Once you hear the clicking sound and the heating system starts working, you can be ensured that the thermostat has been installed properly.

It is recommended to contact a professional, if you do not have any prior experience handling household wirings.

Power Source

This thermostat is wired directly to the line source and does not need batteries to operate. This means you will be free from the hassle of changing the batteries and its related cost.

Now that you got a detailed idea about this basic model from Honeywell’s, let us wrap up this article with an overview of its pros and cons.


  • Simple design
  • Rugged plastic makes it strong
  • Easy to use knob
  • Comes in two variants: double pole and single pole
  • Easy to install
  • Works with 120-220V electric baseboard heater upto 5280 Watts
  • Reasonable price


  • Cannot be used for inductive loads
  • Accuracy is quite low: about +/-5 degrees
  • Bimetallic sensor gives less accurate results at low temperatures.

Thermostats are generally needed during the cold, chilly winter days. If you are ready to buy a new thermostat and need a basic one, this one is ideal for you. It is cost effective and keeps your room nice and toasty at a temperature you wish.

Hope this article helped you to learn the features of the Honey well 4 wire/2wire premium manual thermostat.

Thermostats are one little piece of technology, which have an imperative role in the day-to-day comfort of almost every North American citizen. Ever since Andrew Ure, the Scottish scientist who patented the first bi-metallic thermostat, this small temperature controller has come a long way.

In the late 19th century, around 1884, Albert Butz who invented the formed the “Butz Thermoelectric Regulator Company”, which later got merged and is now one of the iconic thermostats manufacturers in the history of thermostats, the Honeywell Inc.

With more than 180 years of hard work and a vision to provide comfortable and energy efficient solutions to the mankind, Honeywell Inc have produced umpteen number of thermostats ranging from the very basic manual ones to the high end, self learning thermostats.  

These days when digitalization and internet of things are taking over people’s life, there are still some of us who like the simpler version of technology. If you are one of them, then you might like the product I am going to discuss in this article, Honeywell’s RLV3120A1005 digital non-programmable thermostat.

The house of Honeywell launched this simple yet efficient non-programmable line thermostat for electric baseboard heaters, convectors and radiant fan ceilings, back in December 14, 2009. It is rated for 2000 watts at 240 volts and 1000 watts at 120 volts, which means they would be suitable for a 7-9 foot heater.

Honeywell RLV3120A1005 thermostat’s design

Honeywell’s RLV3120A1005 unit has a dimension of 1.5 x 6.5 x 9 inches. This rectangle shaped thermostat weighs around 6.4 ounces and has a smooth white surface with the exteriors made of strong plastic. The front panel constitutes of a digital LCD screen and two push buttons. The buttons are made of plastic, which may not feel great to press as these designed to be a little tilted away from you.

What about its LCD display?

The LCD display is quite large and can be easily read by anyone. It displays the ambient temperature in either Fahrenheit format or the Celsius format. You can choose either of the formats. The display temperature range of this thermostat is 0 °C to 50 °C.

Coming back to its display, one major drawback I see is that it does not have a backlight.

Below the temperature you will find small flames like symbol. This indicates the heating intensity of your heater. In case the heater is not working, you won’t see this symbol. The number of flames seen can be anywhere from 1 to 5, depending on the heating intensity. A single flame symbol indicates that the heater needs to run at 20% intensity (max.) to reach the desired temperature.

This means if you see, for example 3 flames symbol, it indicates that your heating unit may run at at least (3×20)60% intensity to reach the desired temperature. This is a nice feature, since it gives an idea about the heat energy being consumed.

Operation of RLV3120A1005

The operation of this non-programmable thermostat from Honeywell is really simple. Anyone can use it, as it is plain basic. This is the main reason why this product is a wise choice for you, if you are one of those who hate the high end technologies and the complicated operation associated with them.

Just set the temperature to a desired value, and you are good to go. The thermostat will do the rest job to attain and maintain the temperature at the desired value.

How to change/ view the set temperature on the LCD screen?

As already mentioned this unit has 2 push buttons on its front panel, which serve the purpose of temperature adjustment. You can set the temperature in the range of 5 °C to 30 °C.

They are also there for another reason also. Press either of these two buttons, and you will see the set point on the LCD screen for 5 seconds. If you need to change it, you can use either the up button to increase the set point or the down button to decrease the set point.

If the temperature shown on the screen is the set point temperature, an arrow symbol will act as an indicator just above the temperature reading.

In case of Power outage, the thermostat retains the set temperature in its permanent memory. This saves you from resetting the temperature after every power outage.

Choosing the temperature format

As already mentioned, this unit gives you the liberty to choose from either Fahrenheit or Celsius  format. You can select any of these two, whichever suits you the best.

The up and down button when pressed for 3 seconds, will display the current format. Now, using either of these buttons, you can change from Fahrenheit to Celsius or vice versa, as you need.

Will it make clicking, annoying noises during its operation?

This Honeywell thermostat is designed to work silently. Its 100% silent operation is due to the use of TRIAC switching which eliminates the unpleasant and annoying noises during its operation.

This makes it suitable to be installed at bedrooms also.

Accuracy of RLV3120A1005

This thermostat boasts of a precision of ± 0.15°C / 0.27°F. This means the thermostat will throttle the heater to minimize its energy consumption. This prevents the temperature of your room to go any degree cooler or hotter than the set temperature.

The temperature is maintained around ± 0.15°C / 0.27°F of the set point temperature.


As already mentioned, this thermostat can be used to control the heating devices like electric baseboard heaters, convectors and radiant ceiling heaters. The load needs to be resistive only and can go up to 2000W at 240V and can take a minimum resistive load of 200W at 240V.

If you have a resistive load which is either rated below 0.83 A or higher than 83A, then you can not use this thermostat.

Also, this product cannot be used to control fan-forced heating system, central heating and inductive load like a system driven by a relay.


The RLV3120A1005 thermostat can be easily installed using the detailed instructions and by taking proper precautions as per its user’s guide. Both 2 wire and 4 wire installation can be carried out. The wiring of the thermostat is also as easy as connecting one of its wires to the heater wire and the other to the power supply through a solder less connecters for copper wires.

Since it is directly powered by the line power, it does not require any batteries. So there will be no worrying about the changing the batteries and the additional cost that come up with them.

Overview of the pros and cons of RLV3120A1005


  • Sturdy build and smooth plastic body
  • Simple operation
  • Two easy to use UP/DOWN push buttons
  • Large LCD display, which can be read at any angles.
  • Accurate temperature control with a precision of ± 0.15°C / 0.27°F.
  • No clicking noise
  • Compatible with electric baseboard heater, convector and radiant ceilings
  • Temperature format can be changed from Fahrenheit to Celsius and vice-versa
  • View and change the set point temperature on demand.


  • No backlight for the LCD display.
  • Plastic push buttons feels slippery to use
  • Not compatible with inductive loads

As a person who is looking for a sober non programmable thermostat, I hope this article gave you a brief about one of the plenty options available in the market.

Now that you are familiar with the features of the Honeywell RLV3120A1005 thermostat, you can decide whether it is worth your money or not.

Honeywell Inc is renowned for producing quality thermostats in all price range and has a wide range of capabilities in terms of the design and model. Whether you want a high-end sleek, touch-screen thermostat with self learning features or the simple manual thermostat, you have got a plethora of options to choose from. The choice of thermostat depends on the way our lifestyle is shaped and of course, the budget.

If you like sober thermostat model and are not a big fan of the technology or you stay at home for the major part of the day, then you can easily go for a non-programmable thermostat. This type of digital thermostat is pure bliss for people who just live simplicity.

It will save your time from programming, give you the liberty to change the temperature whenever you wish to and at the same time, it is an extremely cheap option, when compared to other thermostat models.

Here in this article, we will talk about a digital non-programmable thermostat from the house of Honeywell, named TL7235A1003.

TL7235A1003 is a double pole, 240 volt line thermostat designed exclusively for baseboard heaters, convectors and fan forced heaters. The contemporary design of this thermostat blends in perfectly with any wall decor.

You can set the temperature anywhere in the range of 40F to 86F. The push buttons on the from panel provide easy control over the process of setting the desired temperature. The clear, digital LCD display shows some vital information and can be back lit, whenever we want it to be.

Thanks to the DPST switch, the clicking noise is reduced which means a less noisy operation.

This was a small gist and overview  about the product, to know the different features in detail read on.

  • Design

Honeywell’s TL7235A1003 is built in a 4.875 in. x 2.75 in. x 0.875 in. (H×W×D) heavy duty package. It is quite sturdy and does not break easily. The front panel consist of a LCD screen three push buttons and an on/off toggle switch. The first two buttons are the UP/DOWN temperature adjustment buttons. These buttons have been indicated through an up-arrow at the top of the Up button and down-arrow at the bottom of the down button, which makes it easier to access without any confusion.  Pressing any of these two buttons, illuminates the LCD screen for 10 sec.

The third button controls the backlight. Once pressed, this would illuminate the LCD screen for 5 Sec. In case you just want to check on the temperature or any other parameters like time etc, but do not want to change the set temperature, this control button comes in handy.

The on/off toggle switch can be used to control the power supply to the heater. Setting it to “OFF” means you have cut the power to the heater.

  • Display

The LCD digital display of TLV7235A1003 thermostat is quiet informative and gives out clear concise details about the temperature and other important things. The backlight feature makes it readable in any lighting condition.

The main highlight of this display is the heating power indicator which tells you an approximate amount of energy consumed to maintain the set temperature. It has a total of 4 S-shaped bars. One such bar indicates 25% duty cycle approximate. This means, say if your thermostat shows 2 such bars, it indicates that the heater is running on a (25+25)50% approximate duty cycle.

This is a good way to get an idea about the maximum amount of energy being consumed for the set temperature.

Another beneficial feature is the heating indicator, which gives at a glance confirmation that the heat is on.

The display also shows temperature in Fahrenheit format. By default, the display shows the actual room temperature.

In case you want to have a look at the set temperature, press the up/down button placed at the front panel. The set point will flash on the screen for 5 sec.   

It also displays two error messages: “HI” and “LO”, in special cases. “HI” corresponds to the event when the room temperature goes beyond 122 F. The“LO” on the other hand, corresponds to the even when the room temperature is below 32F, which indicates that the heating must be activated.

The display resolution of the temperature is about 1F.

  • Temperature Precision

The set temperature of this non programmable unit can be adjusted in between 40F to 86F. It boats of maintaining temperature accuracy, owing to the electronic temperature controller used in it. The 1 degree temperature precision can help you save up to 10% on your energy bills.

  • Compatibility

TLV7235A1003 thermostat unit is designed to control the temperature of the resistive rated electric baseboard heaters, convectors, radiant ceiling heaters and fanforced heaters.

It is rated for 15 Amp at 240 Volts which means it can be used for loads only up to 3600Watt.

Not suitable for inductive loads.

  • Power Source

This thermostat from Honeywell is free from the hassle of battery changing and maintenance. It is wired directly to the 240V, 50-60Hz power source. So, you need not worry about the additional battery charges. It comes with 5,5in copper tinted lead wires for the connection.

The installation of this basic thermostat is quite easy and can be done by anyone who has had prior experience. However, if you are installing it for the first time, it would be safest to get a professional help.

  • Relay Sound

The DPST relay switch used in this thermostat unit maintains the clicking noise at minimum. This ensures a silent operation and hence can be set up at any room including the bedroom. The silent operation of the relay will not create hindrance to your sweet sleep.

Just for your quick reference below are the pros and cons of the Honeywell TLV7235A1003.


  • Sturdy build
  • Sleek design blends with any wall decor
  • Easy push button for temperature and back light control
  • On demand illumination of the LCD screen
  • Indicator that shows the heating unit is ON
  • Indicator that shows how much duty cycle needed to maintain the desired temperature
  • UP/DOWN button also serve two other purpose: 1. To illuminate the screen for 10 sec 2. Flash the set temperature for 5 sec.
  • You can shut the heater off when not needed through the ON/OFF switch.  


  • Sometimes the plastic between the relays heat up and alter the temperature, which in turn may affect the accuracy of the unit.
  • Cannot be used for inductive load and cooling system.

These were all the important features of this device you need to know. As already mentioned, if you are looking for a basic thermostat, this product is a great option to consider. Be it for a working at home professional, a retired person or anyone who is always in and around the house for the most of their time, it is obvious that you need not want to spend extra bucks for just changing the temperature when you can easily get it done manually.

In a nutshell, this unit is a simple yet efficient thermostat and aids reduction in the heating energy consumption and increase savings!   

If your home is having a single stage heating system (like a gas furnace) without any cooling function, you simply need a “heat only thermostat” to control the heating system. A heat only thermostat is designed to perform the basic function of regulating room temperature by controlling the heating system (be it a single stage furnace or a heat pump). Usually, a basic heat only thermostat will be having only two switch controls – 1) an On/Off switch and 2) temperature adjustment buttons.

When put to “ON” position or “Heat” position (some thermostats mark ‘On’ as ‘Heat’), the thermostat will turn ON the furnace/heating system and keep it active until the set temperature is achieved. The ‘adjustment buttons’ can be used to increase/decrease temperature to your desired level.

There will be only 2 terminals for a heat only thermostat, marked ‘R’ and ‘W’. You only need to make two connections between your heating system and the thermostat.

Note 1: Some single stage heating systems have a fan to distribute heat faster. For such systems, heat only thermostats with fan switch option is available. These thermostats will have 3 terminals usually, marked ‘R’ , ‘W’ and ‘G’; where ‘G’ terminal is to connect fan of the furnace.

Note 2: Heat only thermostats are also known as ‘2 wire thermostats’. You may read our guide on 2 wire thermostats, which also covers 2 wire single pole thermostats for line voltage systems.

Heat Only Thermostats

Now let’s see all the popular ‘heat only thermostat’ models out there. As mentioned above, a heat only thermostat is basically a 2 wire thermostat with two terminals ‘R’ and ‘W’, which is suitable to regulate a single stage heating system (without any cooling option).

Note: To regulate a single stage heating system, you can actually use any thermostat that supports single stage wiring. For example, Smart thermostats like Nest, Ecobee, and WiFi thermostats like Honeywell RTH9585WF, Emerson Sensi – all supports single stage wiring. You just need to connect the ‘R’ and ‘W’ terminals of these thermostats, and leave all other terminals not connected. So if you want a technologically advanced thermostat with smart features, internet connectivity and smartphone based control, you better choose one above rather than a basic heat only thermostat.

#1 Honeywell TH1100DV1000 Heat Only Thermostat

This is a basic heat only thermostat model from Honeywell, with temperature range 40 deg F to 90 deg F to choose from. It has only 3 buttons, an Off/Heat button on the side and an up/down button on the front to adjust temperature range.  This model has a square shaped, backlit LCD display, which displays temperature in an easy to read format. TH1100DV also provides compressor protection feature for the heating system.

If you’re using this model in garage, a mode is available where temperature can be ranged from 35 deg F to 90 deg F.

#2 Emerson 1E78 Heat Only Thermostat

1E78-140 is one of the best selling non programmable heat only thermostat from Emerson. This model is compatible to be used with single stage heat only systems, single stage heat pump and milli volt systems. The display is rectangle shaped LCD, with a back light.

1E78 is designed in such a way as a perfect upgrade to an old mechanical thermostat. The body is designed to cover any wall markings by a mechanical thermostat (old models) and in most cases you don’t need an extra wall plate.

#3 LuxPro PSD010B Heat Only Thermostat

If you need a third choice, PSD010B from LuxPro is a popular non programmable heat only thermostat. This model is compatible with all heat only single stage systems. If your system has a fan, LuxPro has a variant of this same model named PSD010BF – which has additional fan control.

The display is rectangle shaped, with a back light, and it displays only the set temperature. The base model PSD010B has only 3 buttons, an On/Off button and an up/down control. The model with fan (PSD010BF) has 4 buttons, an additional button on the side to control fan operation.

If we put it simply, a 2 wire thermostat is one which has only 2 wires coming out of its backside. As you already know, there are different types of thermostats serving different types of heating/cooling systems. Some thermostats will have 4 wires coming out of its back, while some others will be having 5 wires or even 8 wires. So any thermostat with only 2 wires coming out of its back are generally named as a 2 wire thermostat.

As you may already know, thermostats are available for line voltage heating systems (like a baseboard heater) and low voltage heating systems (like a gas furnace or heat pump). They can not be used interchangeably owing to myriad technical reasons. Just like this, a ‘2 wire thermostat’ can be either a line voltage model (operating at 120 V or 240 V) or a low voltage model (operating at 24 volts).

The 2 wire thermostat for line voltage systems are technically known as single pole thermostat (and the 4 wire version is known as double pole thermostat). When it comes to low voltage systems, a 2 wire thermostat is usually known as a “heat only thermostat” and is used for systems like a gas furnace (with only heating option). A 2 wire thermostat can not be used for hvac systems with cooling option, or heating systems with multi stages or a heat pump.

Wiring & Color Code

In the case of a low voltage (24 volts) 2 wire thermostat, there will be a ‘red’ and ‘white’ color wire coming into its back. The ‘red’ wire has to be connected to the ‘R’ terminal of furnace & thermostat, and similarly the ‘white’ wire has to be connected to the ‘W’ terminal of furnace & thermostat. Note: You’ll have to take all the safety precautions before you wire a thermostat. Remember there is risk of electric shock if you fail to keep the safety protocols.

Keep in Mind: If you are having a single stage heat only system (like a furnace) in your home, you can use any kind of thermostat that supports single stage systems. For example, you can use the Nest 3rd Gen smart thermostat or Honeywell RTH9585 wifi thermostat for your ‘heat only’ single stage system. In this case, you just need to connect the ‘R’ and ‘W’ terminals of the thermostats and leave all other terminals intact without making any connection.

The Nest 3rd Gen thermostat has 10 terminals, say Rh, Rc, W1,W2(aux) Y1, Y2, O/B, G, C, etc. You just need to connect ‘red’ wire from furnace to Rh and ‘white’ wire to W1. These 2 connections will set the Nest thermostat as a ‘smart 2 wire thermostat’ taking care of your home heating ‘smartly’.

In the case of a line voltage (120/240 volts) 2 wire thermostat, there will be  ‘red’ and ‘black’ wires coming out of its back (color can vary like ‘red’ and ‘white’ for some brands, some other use ‘black’ and ‘white’)

Differentiating – Line Volt vs Low Volt

Now let’s see how to differentiate a line volt and low voltage 2 wire thermostat. You’d be thinking it is a confusing task to differentiate, as both are having only two wires. Well, the key difference here is the ‘thickness’ of wires coming out of the thermostat. The low voltage (24 volts) model will be having ‘thin wires’ or ‘small wires’ coming out of its back, where as the line voltage (120/240 volts) model will be having ‘thick wires’ or ‘bigger wires’ coming out of its back.

2 Wire Thermostat Models

We now know ‘what exactly is a 2 wire thermostat’. Let’s review some of the popular 2 wire thermostat models used in US households.

Note: Almost all of the ‘2 wire thermostat’ models available in the market are ‘non programmable’ types. If you prefer a programmable variant or a model with WiFi or smart features, you can buy any model you like and wire it up for a single stage heat only system (by just connecting the two wires ‘R’ and ‘W’).

Honeywell TH1100DV1000 – 2 Wire Digital Thermostat

Honeywell TH1100DV

This model from Honeywell (TH1100DV) is the most popular 2 wire thermostat among all other models. This is basic heat only thermostat, with only 3 buttons on the device. The temperature range can be set from 40 deg F to 90 deg F. If you’re using it in garage mode, temperature range can be from 35 deg F to 90 deg F.

Check Price & View Details

The buttons provided are, an up/down button for temperature range adjustments and an Off/Heat button provided on the side to turn thermostat ON/OFF. This model provides compressor protection to the heating system.

Emerson 1E78-140 Non Programmable Model

Emerson 1E78 – 140

This model from Emerson, 1E78-140 is a great upgrade for your old mechanical thermostat (if you still have one in your home). Moreover, 1E78-140 is one of the best selling model in ‘2 wire thermostat’ category after Honeywell TH1100DV.

Check Price & View Details

The reason this model would be a great upgrade to old mechanical thermostats is its design. The body is designed such a way that it covers any marks (on walls) which could occur while replacing your old mechanical thermostat. In most cases, you don’t need an additional wall plate. This model is suitable to be used for single stage furnace, single stage heat pump or milli volt systems.

LuxPro PSD010B – Heat Only Model with Fan

two wire thermostat
Luxpro PSD010BF

PSD010B – is a popular heat only, 2 wirethermostat model from LuxPro. They also have a variant with ‘fan’ control, named PSD010BF – which has ‘fan’ control as an additional feature. Both models has a rectangle shaped backlit LCD display, which shows the set temperature value. They are compatible with all heat only single stage systems.

Check Price & View Details

The base model PSD010B has 3 switches for control, an ON/OFF switch on the side and an up/down control on the front side to adjust temperature. The variant with fan option (PSD010BF) has 4 switches, an additional switch on the side to control fan.

Lux Products Corporation is one of the oldest companies that have been manufacturing home products. Headquartered in Philly, this company was established in 1916, and is a leader in thermostat and smart home products.

A LUX thermostat embodies innovation and quality. You can choose whichever model that suits your interest and budget from the wide range of products they produce in the market.

In this article, we review one of its thermostat , the LUX ELV4. This is a line voltage thermostat and can be placed in your home to control 120/240 V heating only systems and line voltage (120/240-volt) hot water systems with motors up to 1/4 horsepower.

This mercury free thermostat does not only save you from heavy electric bills, but are also environment friendly.

It is a certified energy saver thermostat with programmable memory. Being a 5-2 day programmable thermostat, this allows you to program two set of schedule, one for the 5 week days and another one for the 2 weekends. It also comes with a vacay mode, which can be effectively used to reduce energy consumption, while you are away from your home for short trip. It is one of the few thermostats which have an adjustable temperature swing setting.  

For detailed information of its technical specifications and other features, read further. We have discussed some of them briefly below.

  • Design

LUX EL4 thermostat comes in a striking design, measures 1.8 x 9.5 x 7.5 inches and weighs about 1 pound. It has a clean, white rectangular body, with control buttons placed just below the display screen. It is an ETL certified 100% mercury free thermostat. The front panel flips down to allow you to access the programming buttons and the LUX patented speed dial. You can access the up/down button placed near to the display without removing the cover.

The digital display is quite simple and can be easily comprehended. It shows the time, set temperature and other vital information.

The only drawback is that it does not have a backlight. You will have to switch the lights on of the room, every time you want to view the display in the dark. The small display is another drawback to its design.

  • Programming Modes

Like all other programmable thermostats, the main aim of the LUX ELV4 model is to cut down the energy usage as much as possible.

The efficiency of the LUX ELV4 however, gets an extra point for its default heating schedule, which targets the savings to be upto 33% .

If you want to customize your schedule, there is provision for that as well. You can program the settings as a group of two. One group consists of programmed schedule for the weekdays, that are Monday, Tuesday, Wednesday, Thursday and Friday. The other group is for the two weekend days that are Saturday and Sunday.

For each group you can set 4 on/off periods for Morning, Day, Evening and Night. The temperature can be set to value anywhere between the 45 to 90 degrees. Unlike the Honeywell thermostat, where only two temperatures can be set over the 4 periods, here you can actually set four different temperatures for each period.

The programming is made easy through the on screen programming and the “swing” between temperatures and be adjusted easily. The LUX patented speed dial makes programming simple.

The extended flexibility of programming includes a vacation hold setting, and a temporary temperature override for manual adjustments.

The relay clicking sound while the thermostat goes off and on, is quite loud, this makes it unsuitable to be placed in the bedrooms.

  • Compatibility

If you want a thermostat for your heating only system with a 20 amp circuit breaker, then opt for LUX ELV4. It has a universal design suitable for both 2 pole and 4 pole wire applications.

The devices which are compatible with LUX ELV4 include: line voltage heating systems like baseboard heater, cable and ceiling heaters.

For heating applications which have an inductive load, like a hot circular pump, it can be used only for motors with horsepower up to ¼ (for 120V) and ½ HP (for 240V)

Note: This thermostat CANNOT be used for your cooling system or if your heating appliance has both resistive load such as an electric heating element and an inductive load like a blower fan.

  • Installation

The ELV4 LUX thermostat is easy to install and fits into a wall mounted junction box. It is advisable to check for the line wires and load wires before you start installing, as relying on colour codes for wires may not be suitable for an old wired home.  Always call a licensed technician to install this product, to avoid unnecessary damage due to improper installation.

  • The swing setting

The one distinguishing feature of this thermostat is its “swing” feature. It allows you to set temperature before the heater/fan will cycle. This adjustable differential swing is a great plus of this product.


  • Power Source

The LUX ELV 4, is hard wired to your 110vac house current and batteries are needed as a back up so that the settings remain intact even in the case of a power failure.

Each unit needs 2 AA batteries and the company recommends using the batteries of only 2 major brands. These are non-rechargeable batteries and therefore needs to be replaced every now and then.

LUX ELV4 is a certified energy saving thermostat and is a great buy if you are energy conscious. Along with all these features, it comes with a heating on/off option, which enables you to turn off the heating during summers when heating is not required.

This boosts the energy saving capacity of the thermostat.

If you consider the cost, it is quite fairly priced as compared to other company thermostat with similar features.

You can be assured of a reduced energy bill without compromising on your comfort.

Let me wrap up this review, highlighting the pros and cons of the product in a nutshell:


  • Simple and easy to use design
  • Flexible programming option with separate customizable schedule for the 5 week days and 2 week ends.
  • Four different temperatures can be set for a day.
  • Heating Turn on/off option
  • Battery Backup saves the program settings in the event of a power outage
  • Temporary temperature override, for manual operations
  • Front battery access
  • Comes with a default program which can be used to save energy upto 33%
  • Digital display is easy to read and understand
  • Easy programming through the LUX patented speed dial
  • Adjustable temperature swing


  • The digital display is small
  • No backlight for the display
  • Loud relay clicking noise every time the thermostat goes on and off in a day
  • Cannot be used for heating/cooling systems.