- 1). Shut off the power to your furnace at the circuit breaker box. Lift off the cover to the broken thermostat. Disconnect the wiring from the wall to the old thermostat by unscrewing the screws holding them in place with a Phillips screwdriver.
- 2). Make a notation of where the wires from the wall were connected to the old thermostat wiring with a black marker and labels. Write a letter on each of the old thermostat wires and one on the wire from the wall that corresponds to it. This way you’ll know what corresponding wires on the new unit to use when attaching them to the wall wires.
- 3). Unscrew the mounting screws holding the old thermostat mounting plate to the wall with a flathead or Phillips screwdriver, depending on the type of screw. Lift off the mounting plate. Attach the new mounting plate for the new thermostat in its place with the screws and screwdriver. Set a level on top of the mounting plate to position it evenly; tighten the screws fully.
- 4). Connect the wiring for the new thermostat to the corresponding screws you labeled. Wrap the ends of the wires around the screw posts and tighten the screws with a Phillips screwdriver so they are secured under the screws.
- 5). Place the cover for the new thermostat in place according to the manufacturer’s directions. Turn the power back on at the circuit breaker box.
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