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Installing a Thermostat


Not many home improvement projects offer yearly savings like replacing your old thermostat with new programmable – or “automatic setback” models. When used properly (and depending on the severity of the winters in your area), you could earn a savings of up to $180 on your yearly energy bills.


Programmable thermostats make the best economic sense for every home. However, the steps below can also be followed for installing a manual thermostat:


Quick tip: When shopping for your new thermostat, check the thermostat package to ensure it is compatible with your home's system. Our Buying Guide for programmable thermostats offers additional tips for understanding the different thermostat types and their features.





Step 1 - Remove cover plate

Remove Cover plate • Turn off the power to your heating and air-conditioning system
   at the main service panel.
• Remove the old thermostat cover plate with a screwdriver.

Step 2 - Remove old thermostat

Remove Old Thermostat • Unscrew the thermostat mounting screws and remove the thermostat body.
• Label the low-voltage wires to identify their screw-terminal locations using
   masking tape and then disconnect the wires.
• Remove the thermostat base by loosening the mounting screws. Tape the
   wires to the wall to prevent them from slipping into the wall cavity.

Step 3 - Install new thermostat

Install New Thermostat • Thread the low-voltage wires through the base of the new thermostat and
   mount the thermostat base on the wall using the screws included with
   the thermostat.
• Connect the low-voltage wires to the appropriate screw terminals on the
  thermostat base following the installation diagram in the new thermostat's
  owner's manual.
Optional: Locate the low-voltage transformer that powers the thermostat. The
transformer is usually located near the heating and air-conditioning system or
inside of a furnace access panel. Tighten any loose wire connections and make
sure the wires and sheathing are in good condition.  
• Install the battery or batteries in the thermostat body (if applicable), and attach
  the body to the thermostat base.
• Restore power to your heating/cooling system, then program the thermostat
  according to the manufacturer's instructions.