If your current thermostat has a wire in the c terminal.
Nest thermostat e installation 2 wire.
Begin installation with the app the nest app s step by step instructions make it easy to install and wire your thermostat so use it as your main guide.
Then you likely have a heat pump.
Put this wire in the nest thermostat s o b connector.
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Https amzn to 38a3qz1 in this video we teach you how to hook up the nest thermostat with only 2 wires.
Nest thermostat howto if your furnace isn t supplying power to your nest you ll need this c wire transformer.
The wiring diagram that you ll get from the nest app will tell you to connect the c wire to your nest thermostat.
If your current thermostat doesn t have a wire in the c terminal.
Put this wire in the nest thermostat s w connector.
If there s a white wire in the connector labeled both w and o b then you probably don t have a heat pump.
The nest app won t tell you to connect one do not connect a c wire to your nest thermostat unless the nest app tells you to.