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Thermostat Compatibility Guide

You’ve to check the compatibility of a thermostat with your home’s HVAC system before you buy the thermostat. We believe checking thermostat compatibility is very important for anyone buying a new thermostat or replacing an old model. If you don’t check thermostat compatibility, you might end up purchasing the wrong model. We’ve created a comprehensive thermostat compatibility guide covering almost all the current best-selling thermostat models.

Compatibility Guide for Smart Thermostats

Let’s begin with smart thermostats as they’re the best-selling models currently. Most people prefer to use smart thermostats these days as they are self-learning, save energy and can be controlled from anywhere via the internet.

Ecobee 4 & Ecobee 3 Lite

We’ve published a dedicated review of Ecobee 4 & Ecobee 3 Lite covering all aspects including compatibility. If you’re considering Ecobee thermostat, please go through our guide and get informed.

Ecobee Thermostat Compatibility

The table below explains the compatibility of Ecobee 4 and Ecobee 3 Lite with a wide variety of heating/cooling systems out there.

Nest 3rd Gen & Nest E

Nest thermostats are compatible with a wide range of HVAC systems, especially the Nest 3rd Generation Learning Thermostat. The table below explains Nest thermostat compatibility (Nest 3rd Gen and Nest E) with different types of heating/cooling systems. We’ve covered Nest 3rd Gen and Nest E thermostats in our complete review and comparison guide.

Emerson Sensi ST75

We’ve covered Emerson Sensi ST75 in a detailed review. The table below explains the compatibility of Emerson Sensi ST75 with different types of HVAC systems.

Honeywell RTH9585WF

This model from Honeywell, RTH9585WF is one of the best-selling WiFi thermostat models out there. We’ve listed the complete compatibility of the Honeywell RTH9585 thermostat model in the table below.

Compatibility for Line Voltage Thermostats

Thermostats are basically for two types of systems – low voltage and line voltage. Thermostats designed for line voltage systems (like baseboard heaters, connectors, etc) are not compatible to be used with low voltage systems (like central furnaces, heat pumps, boilers, etc). Similarly, thermostats designed for low-voltage systems can not be used with line voltage systems as well. You’ve to identify your home heating system first (if it’s a low voltage or line voltage system) before choosing your thermostat.

In the USA, 90% of homes are using low-voltage systems like a central furnace or a heat pump, or a boiler as their heating/cooling system. Only about 10% of homes are using line voltage systems like a baseboard heater or a forced fan heater or a convector or a radiant ceiling heater.

MySa – Smart Line Voltage Thermostat

MySa is a smart line voltage thermostat compatible with all commonly used high voltage systems. Complete compatibility is explained in the table below.

Winding up!

We’ve covered almost all best-selling thermostat models in our comprehensive thermostat compatibility guide. We will be adding newer models in the coming days. If we’ve missed an important model, please comment here. We shall add them shortly.

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  1. Steve Mueller says:
    Your comment is awaiting moderation. This is a preview; your comment will be visible after it has been approved.
    I’m looking for your recommendation on some WI-Fi Thermostat options to be used on an AirEase system consisting of an AE96US2V070B12S 2-Stage Furnace and an AirEase 4SCU16LS124 2-Stage A/C along with an Aprilaire 700 Humidifier. Thanks !!
  2. Barbara De May says:
    Your comment is awaiting moderation. This is a preview; your comment will be visible after it has been approved.
    Don’t have Wi-Fi have heat pump. What thermostat can we use that is also programmable. What is a C-wire
  3. Kandy Willhoite says:
    Your comment is awaiting moderation. This is a preview; your comment will be visible after it has been approved.
    What thermastate replaces a jantorl thermastate
  4. Gania says:
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    Is it possible to control the noise coming out of the pressed water in different apartments? In other words: someone who has the using the remote for the heating control can he create the sounds like the sound of starting the heating cycle . Because there are strong pounding or banging sounds coming out of the heater only in one apartment. Very strong very often. Thank you
  5. Lertets says:
    Your comment is awaiting moderation. This is a preview; your comment will be visible after it has been approved.
    While most 24 V heating and cooling systems are compatible with Nest thermostats, there are some systems that aren’t compatible. You can quickly tell if you have one of these systems without having to use the Compatibility Checker or to look at your thermostat’s wiring.
  6. Michael Pearson says:
    Your comment is awaiting moderation. This is a preview; your comment will be visible after it has been approved.
    Is honeywell RTH9585WF compatible with ritetemp 8050 ?
  7. dave says:
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    digital white rogers thermostat…….. wanting to replace it with a honeywell RTH6580WF. terminals on white have wires to R,G,Y,O/B,E,W2, and C..Terminals available on honeywell are K,L,AUX/E, G, C, Y, R, Rc.. with a jumper between R and Rc…. this is for a heat pump which i do have.
  8. Why You Should Choose a Touch Screen Thermostat for your Smart Home says:
    Your comment is awaiting moderation. This is a preview; your comment will be visible after it has been approved.

    […] a thermostat is compatibility with your hvac system. If you’ve not checked this, please read my article on thermostat compatibility – which compares the compatibility of all popular thermostats with different types of hvac […]

  9. Paige says:
    Your comment is awaiting moderation. This is a preview; your comment will be visible after it has been approved.
    help. I have an PRO1 IAQ for my 3h/2c heat pump. We are burning up, the unit will not shut off unless manual override. Face temp is not correct (by 5-10 degrees. I need a new one that we can install, non programable would be great …. Any suggestions???
  10. Larry says:

    Can an ecobee or Nest thermostat handle an American Standard variable-speed heat pump system?

  11. Bruce Oneal Somers says:
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    I have a Bosch 3 ton heat pump and found the Honeywell thermostat energizes the reversing valve only on cool and not heat. I’ve tried wiring to the O/B terminal but it does not recognize the reversing valve needs to be energized to heat. I will look for a Rheem thermostat for compatibility..
  12. Heat Pump Thermostat - Choose the right Thermostat for Heat Pumps says:
    Your comment is awaiting moderation. This is a preview; your comment will be visible after it has been approved.

    […] mind is “not all thermostats are compatible with heat pumps”. You’ve to choose a thermostat that is compatible with your heat […]

  13. HomeKit Thermostat - Guide to Find the Best Apple Homekit Thermostat says:
    Your comment is awaiting moderation. This is a preview; your comment will be visible after it has been approved.

    […] 4H/2C (4 stages of heating and 2 stages of cooling) type multi stage HVAC systems. You may read our thermostat compatibility guide – where we comprehensively cover compatibility of different popular thermostat models.  Both […]

  14. Bill Mawhinney says:
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    We have a three wire thermostat on our Earth System International heat pump which no longer communicates with our heat pump. We are trying to find a compatible thermostat but are having trouble. The model number is P/N M2594-01. Can you help me? Thanks
  15. Joey says:

    Have a heat Boiler and trying to use a T5 Smart Thermostat. It is a Utica heat boiler. How would I be able to wire this with only two wires coming from the boiler — Red and White. I also have a 24V AC local power supply to power up the T5 unit. Let me know. Thanks.

    • Mathew Kevin says:

      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.

      For example, 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/boiler 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’.