Whether your old thermostat is broken or you simply want to install a newer, better model, replacing a thermostat is a simple process that only takes a few minutes.
1. The only tools that you will need to replace a thermostat are a crosshead screwdriver and masking tape, as well as the replacement thermostat. All of these items are available at most hardware stores.
2. Before you begin working on your thermostat, turn the power off to your HVAC system at the fuse box to ensure your safety.
3. Then, use the screwdriver to unscrew the faceplate from the old thermostat, exposing the wires underneath.
4. Use the masking tape to label the wires that are attached to the old thermostat, noting which terminal each wire attaches to, and then disconnect the wires.
5. Once you have labelled and disconnected every wire, use the screwdriver to remove the mounting screws holding the thermostat body in the wall. Remove the old thermostat completely, and tape the labelled wires to the wall to prevent them from slipping into the newly opened hole in the wall.
6. Thread the wires into the new thermostat, but do not yet attach them to their terminals.
7. Once the wires are all threaded through, use the screwdriver to mount the new thermostat into the wall, using the same screw holes as the old thermostat.
8. Then, attach the wires to the respective terminals, using the labels that you previously attached to each one.
9. Depending on the model, your new thermostat may need a battery. If it does, install it into the body of the thermostat, and then use the screwdriver to install the faceplate onto the thermostat.
10. You can now turn the power back on to your HVAC system from the fuse box.
11. Check to see that your thermostat is working properly. If it is not turning on or responding, turn off the power again and remove the faceplate and check to ensure that all the wires are properly attached to their terminals. If the problem is still not fixed, the issue may not be with your thermostat, and you should consult an electrician or air conditioning service such as Metro Air.
12. If you have a programmable thermostat, follow the instructions that came with it to program your HVAC system accordingly. If you do not have a programmable thermostat, you're now able to continue controlling your home's climate as you were before.
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