Install a Digital Thermostat
STEP ONE: BUY A DIGITAL THERMOSTAT
STEP TWO: SHUT OFF POWER TO YOUR FURNACE
STEP THREE: REMOVE THE OLD THERMOSTAT
STEP FOUR: LABEL THE WIRES
When you unscrew the wall mount, you should see several wires running to the back of the old thermostat. With a piece of masking tape, label each wire according to its terminal. If you’re unsure of what that means, take a look at the photo on the right. See how each wire goes to a set screw? And how each screw has a letter next to it? These are the terminals. This is a significant step because you will need to attach the wires to the correct terminal later! Once you’re done labeling use a screwdriver to disconnect the wires. Then take another piece of masking tape and secure the wires to the wall, so they don’t slide back down behind the wall.
Note: There may be extra wires that aren’t in use and that’s OK, simply disregard them!
STEP FIVE: MOUNT YOUR NEW THERMOSTAT
If you hit hollow space behind the wall, use the plastic anchors included with the new thermostat. Note: Anchors are important for protecting your wall. They give the screw a secure hold where it won’t eat through your drywall or plaster with the threads and quickly loosen.