Smart thermostat wall heater8/8/2023 ![]() ![]() ![]() Proprietary systems aren’t compatible with Google Nest thermostats. If your system only has two wires, but you have both heating and cooling, your system is likely proprietary.If you find wires in your thermostat’s connector that have non-standard labels (for instance 1,2,3, or A, B, C), your system is proprietary.If you have one of the system types below, it won’t work with a Nest thermostat. 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. While most 24 V heating and cooling systems are compatible with Nest thermostats, there are some systems that aren’t compatible. The Nest Thermostat E’s * or OB connector lets you install a heat pump, a second stage of heating, or a second stage of cooling. ![]() ![]() The Nest Learning Thermostat’s * connector lets you install a humidifier, a dehumidifier, emergency heat, multiple fan speeds, or a 3rd stage of heating. Nest thermostats also have a star connector * that offers you some flexibility to install specialized systems. How the Nest thermostat works with zoned systems About the Nest thermostat’s star connector However, there are some zoned systems that require a C wire to work with a Nest thermostat. Nest thermostats are compatible with zoned systems, including zoned systems with dampers. Whole-home humidifiers and dehumidifiers (compatible with Nest Learning Thermostat only)Ģ Nest thermostat can only support one of these systems at a time.Dual transformer systems (Systems that have more than one R wire).Dual fuel systems (heat pump with furnace).Important: Professional installation is recommended for some systems since their wiring and setup can be complicated. If you have one of these systems, contact a local HVAC professional. Two stages of cooling and two or three stage furnace heating 2ġ Your system requires advanced configuration and wiring. Two stage heat pump with separate two stage furnace heating (Dual fuel) 1, 2 Two stage heat pump with or without AUX heat Single stage heat pump with separate two stage furnace heating (Dual fuel) 1 Single stage heat pump with separate single stage furnace heating (Dual fuel) 1 Single stage heat pump with or without AUX heat Two stages of heating with one stage of cooling Single stage heating with two stages of cooling Heat only or cool only C wire or Nest Power Connector required Heat only, cool only, or heat pump systems They work with all common fuel types including natural gas, oil, and electricity. Google Nest thermostats are designed to work with most 24 V systems. (This is where you'll need to consult your thermostat, relay and transformer manufacturers.) You also need to check and make sure your transformer and relay work with your heater's voltage.The table below summarizes systems that are generally compatible with Nest thermostats, however, you need to use the online Compatibility Checker for a definitive answer about what will work in your home. You'll also need to get a properly sized transformer to power your relay and thermostat. (Keep in mind that you'll need one smart thermostat for each older thermostat you are replacing.) You'll want to ensure that you have a properly sized relay to provide power to your heater. The relay is then a bridge between the thermostat and the heater, allowing the low voltage thermostat to control the line voltage heater. The transformer converts the line voltage power into low voltage power to provide energy to the relay and the thermostat. But that's where relays and transformers come in. If you hooked up a low-voltage thermostat directly to one of our heaters, it would fry the thermostat. Electric baseboard and fan heaters work with line-voltage thermostats, which can be either 120 or 240 volts. Those are controlled by low voltage thermostats, which use 24 volts. The Honeywell, Lyric, Nest and other smart thermostats are designed to work with central home heating systems. ![]()
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