- Step 1: Turn off the main electrical power switch to the heating and air conditioning unit.
- Step 2: Pry the cover from your old thermostat. Unscrew the wall mount to separate the thermostat's wiring from the wall.
- Step 3: 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.
- TIP: Loosely knot the wires together to prevent them from slipping back inside the wall as you remove the sub-base.
- Step 4: 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.
- TIP: Make sure the new thermostat is level so it will work properly.
- Step 5: Drill the screw holes and hammer the drywall anchors into the holes until they are flush with the wall.
- Step 6: Carefully connect each wire to the new terminal and screw the new thermostat sub-base to the wall.
- Step 7: Replace the outside cover of the new thermostat and restore power to the furnace.
- FACT: Did you know?If geothermal systems were installed nationwide, they could save several billion dollars annually in energy costs and substantially reduce pollution.
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