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Step 1. Turn off the power to the furnace at the main service panel. Then, remove the thermostat cover.

Step 2. The body of the thermostat is held to a wall plate with screws. Remove these screws and pull the body away from the wall plate. Set the body aside.

Step 3. The low-voltage wires that power the thermostat are held by screw terminals to the mounting plate. Do not remove the wires until you label them with tape, according to the letter printed on the terminal to which each wire is attached.

Step 4. Once all the wires are labeled and removed from the mounting plate, tape the cable that holds these wires to the wall to keep it from falling back into the wall. Then unscrew the mounting plate and set it aside.