Getting a pro to replace a broken thermostat can be costly, but if you pay close attention, you can learn how to replace it yourself.
You Will Need
* A Phillips screwdriver
* Masking tape
* A pen
* A new thermostat
* A level
* A drill with a 3/16-inch bit
* Drywall anchors
* A hammer
Turn off the main electrical power switch to the heating and air conditioning unit.
Pry the cover from your old thermostat. Unscrew the wall mount to separate the thermostat's wiring from the wall.
Using masking tape, label each wire as you disconnect it from its terminal connector. Then slip the sub-base over the wires and remove it from the wall.
Loosely knot the wires together to prevent them from slipping back inside the wall as you remove the sub-base.
Pull the wires through the feed hole in the new thermostat and place it flat against the wall. Use a level to position it, and then mark the top, sides, and screw holes with a pen.
Make sure the new thermostat is level so it will work properly.
Drill the screw holes and hammer the drywall anchors into the holes until they are flush with the wall.
Carefully connect each wire to the new terminal and screw the new thermostat sub-base to the wall.
Replace the outside cover of the new thermostat and restore power to the furnace.
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