How to Change a Home Heating Thermostat

Written by sienna condy
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Whether you are repairing a faulty thermostat or upgrading to one that is programmable, replacing your thermostat is a quick project that can save you a lot in home heating and cooling bills. Old thermostats are not as accurate as modern digital ones, and a thermostat you can program will save you from heating your home when you aren't there. Replacing your thermostat can be accomplished in less than an hour.

Skill level:

Things you need

  • Replacement thermostat
  • Screwdrivers
  • Masking tape
  • Pen

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  1. 1

    Turn off the breaker to the heating unit.

  2. 2

    Remove the cover to your thermostat. This is usually as simple as prying it off, but it's possible you may have to remove some screws.

  3. 3

    Remove the mounting screws holding the thermostat body to your wall.

  4. 4

    Remove the wires going into your thermostat from the terminal block using a small, slotted screwdriver. These wires should be colour coded. However, you should label them according to the letter code on the thermostat, just in case the original installer used a nonstandard system. Use masking tape and a pen to label them.

  5. 5

    Replace the wires in your new thermostat, following the manufacturer's instructions. Match the letter code from your old thermostat to the new one.

  6. 6

    Attach the new thermostat body to the wall. Replace the cover and turn power back on to the system.

  7. 7

    Test the thermostat by raising and lowering the desired temperature to make sure both heating and cooling systems kick on when they should.

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