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How do you replace a thermostat?

How to turn off the power to the A/C and furnace. It's better to be safe than sorry. ... The face of the old thermostat needs to be removed. Take a picture of the wires. ... The wires need to be disconnected from the old thermostat. ... Old Mount should be removed. The Thermostat Mount needs to be put on. The wall has a screw faceplate mount on it. ... Attach a new thermostat face.

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