Step 2 · Remove Old Thermostat

Gently pull the faceplate of your old thermostat away from the wall. Some thermostats may have screws or clips holding them in place. Once the faceplate is removed, you will see the wiring connected to the thermostat base. Take a clear picture of the existing wiring connections, noting which wire connects to which terminal. This picture will serve as a crucial reference for connecting the Nest thermostat correctly.