Question: how to change air conditioner thermostat?
Answer: Turn Off Power to A/C and Furnace. ...  Remove Face of Old Thermostat. Take a Picture of the Wires. ...  Disconnect Wires from Old Thermostat. ...  Remove Old Mount. Put on the New Thermostat Mount and Connect Wires. ...  Screw Faceplate Mount to Wall. ...  Attach New Thermostat Face.