Nest Thermostat works with most 24 V heating and cooling systems, including furnaces, air conditioners, boilers and heat pumps with either forced-air or radiant delivery.

Some systems, including heating-only, cooling-only, zone-controlled, and heat pump systems, require a C wire or the Nest Power Connector. Go to g.co/nest/cwire for details. Note:Only one of the wires that go into theconnector (HUM,DEHUM,E,W 3,G 3) can be connected to the Nest thermostat. The 3rd-genNest Learning Thermostat supports systems with either multiple fan speeds (G 2/G 3) or with multiple stages of heating (AUX/W 2/W 3) and cooling (Y 2).If you have a dual fuel system it is strongly recommended that you chooseprofessional installation. TheNest Thermostat E works with 85% of 24 V heating and cooling systems, including gas, electric, forced air, heat pump, radiant, oil, hot water, solar and geothermal. The Nest Learning Thermostat is designed to work even if your home doesn't have a commonCwire, but installing a newCwire may be required in rare cases. Note:Only one of the wires that go into theconnector (HUM,DEHUM,E,W 3) can be connected to the Nest Learning Thermostat. Pull the thermostat wires through the hole in the steel plate. Then secure the plate to the electrical box with two of the included short screws.

Hold the trim plate against the wall and use the bubble level in the thermostat base to make sure everything is level.The Nest Learning Thermostat works with 95% of 24 V heating and cooling systems, including gas, electric, forced air, heat pump, radiant, oil, hot water, solar and geothermal. This is based on data gathered through Nest’s online compatibility tool. If you have a dual fuel system or a whole-home humidifier/dehumidifier, it is strongly recommended that you choose professional installation. If you have a dual fuel system, a whole-home humidifier/dehumidifier or a multi-speed fan, it is strongly recommended that you choose professional installation.

The Nest Learning Thermostat E is designed to work even if your home doesn't have a common C wire, but installation ofa new C wire or the Nest Power Connectormay be required in rare cases. Heating and Cooling: one stage of heating (W1) and cooling (Y1) and a second stage of either heating (W2)or cooling (Y2). Heating and cooling:1 stage of heating (W1) and cooling (Y1) and a second stage of either heating (W2) or cooling (Y2). The Nest Learning Thermostat is designed to work even if your home doesn't have a commonCwire, but installing a newCwire or the Nest Power Connectormay be required in some cases.