How to Install a Thermostat for a Gas Heater


Programmable thermostats can help you save up to 33 percent on your monthly utility bills because of their energy-saving features. Even if you have a gas heater, you can install a programmable thermostat and enjoy these benefits. The gas used to operate the heater happens in the HVAC unit, not in the thermostat, so the process to install a thermostat for a gas heater is the same as it is for an electric heater.

Things You'll Need

  • Screwdriver
  • Pencil
  • Thermostat
  • Level
  • Drill
  • Drill bit
  • Mounting anchors
  • Turn off the circuit breaker that provides power to the HVAC unit. If you leave it on while you work with your thermostat wiring, it's possible to blow the transformer that powers your HVAC unit.

  • Unscrew the existing thermostat's sub-base from the wall, which will pull the thermostat off the wall.

  • Loosen the screw terminals where your wiring connects on the back of the thermostat. Slightly loosening the screws will allow you to easily remove the wires held into those screw terminals.

  • Mark the location where your new thermostat will mount on the wall, using a level to make sure it sits level on the wall. Use a pencil to mark spots where you need to drill so you can install your new thermostat.

  • Use the drill bit enclosed in the package with your mounting anchors to drill pilot holes on the locations you designated.

  • Hammer your mounting anchors into the pilot holes until the lip on the end of the mounting anchor is flush up against the wall.

  • Connect your wiring using the color-coded wiring system on the back of your new thermostat. The red wire will connect to the red terminal to provide power to the heater/air conditioner transformer. The green wire connects to the green terminal to control the fan and the blower. The yellow wire connects to the yellow terminal to power the air conditioner, and the white wire connects to the white terminal to power the heater.

  • Drill screws into the sub-base and into the mounting anchors you installed to mount the thermostat onto the wall.

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