Installing a Thermostat

Under 2 hours

All you need is a screwdriver to help increase convenience, comfort and energy efficiency

Installing a Thermostat

Not many home improvement projects offer yearly savings like replacing your old thermostat with new programmable, or “automatic setback” model. 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 following steps can also be used for installing a manual thermostat:

Tip: When shopping for your new thermostat, check the thermostat package to ensure it is compatible with your home's system. Our Thermostats buying guide offers additional tips for understanding the different thermostat types and their features.

This guide highlights the procedures for measuring and then making adjustments to ensure the table is properly aligned.

WHAT YOU NEED FOR THIS project

1
Turn off power to HVAC system
Turn power off to HVAC - Installing a Thermostat

• Begin by turning off the power for your heating and air-conditioning system at the main service panel.
• Remove the old thermostat cover plate with a screwdriver.

2
Remove old thermostat
Remove old thermostat - Installing a 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.

3
Install new thermostat
Install new  thermostat - Installing a 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.