2018 has become a stellar year for technologies, and the star of them all? Home-based IoT or Internet of Things! The electronics have evolved far beyond their “manual input” titles. They have become smart. Now, they can learn from humans and do things that will help us live better without us even having to tinker them all day long. One such invention is the Smartphone controlled thermostat or smart thermostats as they are widely known.

Apps are made available in Google Play Store and Apple iTunes by respective companies that users can download to control their smart thermostats.

Now, this technology is something revolutionary. Imagine a system adjusting the room temperatures based on your activity or presence! Imagine the heater or air conditioner in your home working on idle when you are not home but springing back to action a few moments before you reach back home! Thanks to the smart thermostat, you will no longer have to imagine it! The technology is already here.

If the Smart thermostat doesn’t win you over with its smart features, the energy savings definitely will!

What are Smart Thermostats?

Smart thermostats mainly fall into two categories:

  1. Smart thermostats that learn from their surroundings
  2. Smart thermostats that interact with the internet to enable programming

Now, the best thermostats are a hybrid of the above-listed points. Hence, the top of the line smart thermostats can learn on their own while being connected to other devices.

What Do You Stand to Gain by Using a Smart Thermostat?

The predominant reason why smart thermostats have gained so much traction can be attributed to their role in cutting costs when it comes to electricity. If your home air-conditioners were to make changes to the temperature inside your home based on the outside climate and the level of activity, then you are looking at a system that will give you optimum performance.

Also, the air conditioning and heating systems of your home can be centrally controlled from your smartphone. There are many advantages just through this option such as:

  • You can control the room temperature at your home when you are at work.
  • You can keep the home at a stable temperature when you are away on vacation.
  • The smartphone will alert you if there are unusual temperature changes in your home.
  • The Geo-Fencing technology enables the thermostat to adjust the temperature as you are on your way back home.
  • It can track you through the home to provide cooling in the room that you are currently in.
  • You can view the energy usage reports through your smartphone.

The EPA has estimated that a home enabled with smart thermostats cuts down on electricity costs by a factor of 20 to 30 percent.

Best Smartphone-Controlled Thermostats

1) Nest Learning Thermostat

Nest Learning Thermostat is a hybrid thermostat that can learn from its surroundings and has Wi-Fi connectivity. Hence, this is the best hybrid smart thermostat you can currently buy. The design element of the Nest Learning smart thermostat is just stunning. The aluminum builds with the circular display blend in nicely with any kind of home, providing a modern and sleek look.

Nest -3rd Gen – Smartphone Controlled Thermostat

There are many user-oriented features available on this device. One of the best features of the product is definitely the feature called FarSight. It is essentially an option where the device’s display can be programmed to show the temperature or time even when you are not interacting with it. So, the device transforms into a sleek modern clock.

With Nest Learning smart thermostat, you get a self-aware thermostat that learns the user’s living patterns. So, if you are going out to work, the device will turn down the power of the heater or air conditioner to save on energy. By the time you are back home, the device will have everything switched back on to just the way you like it. You can also control the device straight from your smartphone using the Nest Learning app.

Nest – Smartphone App

It is also noteworthy that the device doesn’t need a C-wire to operate.

There are three versions or generations of this product.

The first generation:

  • Display Size: 2.75 inch diameter with 320x320px display
  • Connectivity: 802.11b/g/n @2.4GHz, Zigbee @2.4GHz
  • Sensors: Temperature, Ambient Light, Near-Field Activity, Far-Field Activity, and humidity
  • Features: Temperature, Airware, Auto-schedule, Nest Leaf, Auto-Away, Energy History, Time-to
  • This is the least pricey among the three.

The Second Generation:

  • Display Size: 2.75 inch diameter with 320x320px display
  • Connectivity: 802.11b/g/n @2.4GHz, Zigbee @2.4GHz
  • Sensors: Temperature, Ambient Light, Near-Field Activity, Far-Field Activity, and humidity
  • Features: Heat Pump, System match, Early on, and Balance plus all the feature of Generation one model
  • The cost of Generation two model is a bit more than the Generation one.

The Third Generation:

  • Display Size: 3.25 inch diameter with 480x480px display
  • Connectivity: 802.11b/g/n @2.4GHz, 802.11a/n @5GHz, 802.15.4 @2.4GHz, Bluetooth LE
  • Sensors: Temperature (10 Sensors), Ambient Light, Near-Field Activity, Far-Field Activity, and Humidity
  • Features: Water/Boiler control, FarSight, plus all the features of the Generation two model
  • Generation Three model costs the highest amongst the three.

2) Ecobee4 Smart Thermostat

Ecobee has made a really impressive product with Ecobee4 smart thermostat. The device comes with Amazon Alexa built in! The device, hence, processes all the features that Alexa can give you. You can just speak to the device to adjust the room temperature, and this is just one of the commands that you can give. This feature is enabled using the Far-Field that Ecobee uses to recognize voice even from a considerable amount of distance.

Ecobee4 – Smartphone Controlled Thermostat

Also, the device can spot areas where there is an unusual amount of heat and can provide direct cooling to that area. The smart capabilities of Ecobee4 are fully recognized only when you know that it can be connected with various smart voice assistants like Siri, Google now, etc.

Ecobee Smart App

The learning capabilities of the Ecobee4 are also commendable as the device can sense if you are home or not. Also, the device can track whether or not you are sleeping to set the temperature more comfortably. Ecobee4 uses remote sensors called Room Sensors to track whether you are home or not.

This also means that the device does not have to be centrally mounted to have a grasp of the room temperatures. Also, you can add as many as Room Sensors as you want to increase the accuracy of the device to detect temperatures.

3) Ecobee3 Lite

If you want almost all the functions of Ecobee4 without the hefty price tag, then Ecobee3 Lite is the best option for you. When you go for Ecobee3, you will be missing out on some features like the Alexa integration. So, it won’t respond to your voice anymore, but then again, you can control the device by using your phone’s digital assistant.

Ecobee3 Lite Thermostat

You will also be missing out on the Room Sensors that come with the product. Although it does support room sensors, you will have to buy them separately.

Ecobee3 Lite uses Geo-fencing to make up for the lack of Motion sensors. Our top 2 picks (Nest Learning and Ecobee4) come with motions sensors. Geo-fencing uses the location of your smartphone to enable smart cooling.

Ecobee-Smartphone App

If you consider the missing features when compared to Ecobee4, Ecobee3 Lite lacks the accessory control, Humidifier, Dehumidifier and ventilator options on the device.

But if all these things are omissions that you can live without, then Ecobee3 is the best option amongst the two. Ecobee3 looks as sleek and stylish as its costly upgrade and can do many of the functions of Ecobee4 without a hiccup.

4) Honeywell Smart Thermostat

One of the best features of Honeywell smart thermostat is that it has a bright and user-oriented LCD touchscreen. The programmable thermostat is Wi-Fi enabled so that it stays connected all the time.

Honeywell TH9320WF

With the smart remote control system, you can control the thermostat from anywhere using your smartphone. The display shows every important information upfront so that you won’t have to interact with the device to know them.

Also, Honeywell has a web app that you can use to configure your system if you can’t use the smartphone app. The seven-day schedule is a major advantage of the system. Also, it has Amazon Alexa integration to control the thermostat.

The five-year warranty makes Honeywell Smart thermostat a bargain!

If these features don’t sway your decision in favor of the Honeywell Smart thermostat, then the price definitely will. It packs a great value as the price of this product is about 30% less than the top two picks on this list. So if you are after the bang per buck factor, this product might be it!

5) Emerson Sensi Smart Thermostat

Emerson Sensi smart thermostat is the best option if your home isn’t built to the modern norm of smart homes.  The reason why we pitch this product is that it can be mounted in your home without any significant rewiring hassles.

Emerson Sensi – Thermostat

Many of the old homes are hesitant to bring smart capabilities because of this very reason. In most cases, The Emerson Sensi smart thermostat doesn’t need a C-wire to work. This is a huge advantage when you are planning on buying a smart thermostat for your home that doesn’t have ultra-modern air conditioning equipment.

The Emerson Sensi has a very bright display and can work on a pair of AA batteries. The thermostat can be controlled via the smartphone app, and it gets all the updates through its Wi-Fi connectivity. It also plays well with mainstream AI assistants like Alexa, Google home, and Google assistant.

Emerson Sensi App

The Geo-fencing technology is a great feature to let your air conditioning know if you are coming home early. It is a well-designed product indeed!

Other choices available

6) Vine Wi-Fi Programmable Smart Thermostat

Vine -Smartphone Controlled Thermostat

Vine is a relatively new player in the game when it comes to smart thermostats. But that doesn’t mean it lacks the technological innovations that our top 5 picks had. The touchscreen is designed and programmed in such a way that It has a modern feel to it. Amazon Alexa integration is also a really appreciated feature.

Vine – Smartphone App


  1. The thermostat can be controlled from your smartphone as it provides app support for both Android and iOS.
  2. Supports weather forecasts and night light
  3. The seven-day schedule is a much-appreciated option.
  4. Pre-set settings for different climates

7) FirstAlert – Smart Thermostat

FirstAlert – Smartphone Controlled Thermostat

This product also gives you the complete freedom of controlling the air conditioners in your home through your mobile. You can also use Alexa through your smartphone to control the thermostat any time you want. The full touch color display is pure joy to use. The wallpaper ability is a nice touch to personalize the device to your taste.

FirstAlert – Smartphone App


  • The scheduling feature of the device helps you create custom cooling every single day.
  • You can send texts to the thermostat, and it will be shown on the home screen.
  • Keep a record of the energy consumption with 7-day Energy usage charts.
  • The smart assistant helps you configure the device in minutes.

8) Bosch Connected Thermostat

Bosch – Smartphone Controlled Thermostat

Bosch is a company that has created a reputation for itself by creating top-notch products. The same trend can be seen with their smart thermostat as well. It has got smart features like Alexa compatibility so that you can control the device through your smartphone itself. Another attractive feature is its 5-inch display that shows you everything relevant at a glance.

Bosch Smartphone App


  • The smartphone app gives you complete control of the device.
  • It can work just as well without the Wi-Fi connectivity (though it will affect the smartphone link).
  • Schedulers help you pre program the device when you are away or at work.
  • Compatible with almost all the HVAC systems


Smart homes are the future of living. They are a completely automated setup that changes the environment based on your schedules and likes. Smart thermostats don’t just cater to your comfort; they also save you time and money while doing it. With the onset of smart assistants and AI, there hasn’t been a better time than now to revolutionize how you live!