![]() Remote sensor wires are typically used to give your thermostat outside weather data. Systems that use coal, wood chips, pellets, anthracite, or other biomass materials are typically incompatible with Nest thermostats.High voltage thermostats should only be installed or uninstalled by a professional due to the high voltage that they carry.Contact a local HVAC professional and have them install a step down transformer to 20 - 30 V. Note: In some cases, it is possible to make a high voltage system Nest-compatible. High voltage thermostats are usually labeled 110, 115, 120 or 240 VAC.Wire nuts are often used to connect the thermostat to the system wires. High voltage thermostats are often built into the wall and typically have 2 to 4 thick wires coming out of the thermostat.High voltage systems are usually electric baseboard heating systems or other radiant systems powered by electricity.These systems use much less electricity than low voltage systems and can't deliver the right amount of power to Nest thermostats. Millivolt systems are typically wall heaters or floor heaters and use electricity or natural gas.However, some proprietary systems can be rewired by a pro installer to be compatible. 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. 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.
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