a programmable thermostat with a hand-held remote
Steps // How to Install an Energy-Saving Programmable Thermostat
1 ×

Remove the Old Thermostat

 
Step One // How to Install an Energy-Saving Programmable Thermostat

Remove the Old Thermostat

person unscrewing an old thermostat in order to remove it
Photo by Ryan Benyi

Cut off power to the furnace using the emergency shutoff or breaker switch, then unscrew the thermostat's mounting bracket. As you disconnect each wire from its terminal, label the wire with the letter of the terminal it came from. Tape the wires to the wall so that you don't lose them. Some older thermostats contain mercury; for information on proper disposal, go to the .

 
2 ×

Connect the New Thermostat

 
Step Two // How to Install an Energy-Saving Programmable Thermostat

Connect the New Thermostat

connecting wires to a new thermostat using needlenose pliers and a screwdriver
Photo by Ryan Benyi

Line up the new bracket with the hole in the wall, and connect the wires to the terminals on the bracket, following the diagram in the instructions. This thermostat needs at least three low-voltage wires: a black one and a white one, which turn the furnace off and on, and one that powers the thermostat. If you have only two wires, call an electrician or HVAC contractor to run the additional 18- or 22-gauge wire.

 
3 ×

Connect to the Furnace

 
Step Three // How to Install an Energy-Saving Programmable Thermostat

Connect to the Furnace

Lance Marques connects the thermostat power wire to the furnace
Photo by Ryan Benyi

Let your contractor hook up the new wire to the furnace and turn on the furnace's power. Now snap the thermostat's face onto the bracket. When it lights up, follow the prompts to set the temperatures you want the house to be when you wake up, leave for work, return home, and go to bed.

 
4 ×

Mount the Outdoor Sensor

 
Step Four // How to Install an Energy-Saving Programmable Thermostat

Mount the Outdoor Sensor

Lance Marques mounts the outdoor sensor that allows the thermostat to measure the temperature outside
Photo by Ryan Benyi

This wireless, battery-powered device allows the thermostat to display outside temperatures. Turn it on while standing next to the thermostat. When both units establish a connection, place the sensor in a bracket mounted on the north side of the house, above the snow line.

 

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