How to Install a Programmable Thermostat

Save on your utility bills with these step-by-step instructions.
Programmable Thermostat

Programmable Thermostat

Many furnace and air-conditioner thermostats are programmable in increments of 15 minutes, allowing you to be very precise about how much energy you use. Here's how to remove your old thermostat and install a new one:

Materials and Tools:

one or two standard screwdrivers

drill and drill bit

level

safety glasses

Note: Most older thermostats contain mercury and should be recycled if possible. Check with a recycling company or a local heating and cooling company to find out where to take your old thermostat.

Steps:

Remove the old thermostat

  1. Disconnect the power.
  2. Remove the thermostat cover.
  3. Locate the wires from the furnace and remove them.
  4. Label each wire with the labels supplied with the new thermostat.
  5. Remove the body of the thermostat.
  6. Spread the wires to keep them from falling behind the wall.

Install the new thermostat

  1. Remove the base from the new thermostat.
  2. Place the base on the wall where the previous thermostat was located. Use a level to make sure the base is as straight as possible.
  3. Mark the wall through the mounting holes on the base.
  4. Remove the base. Using marks for reference, drill holes for mounting. Be sure the drill bit is thinner than the screws you'll be using.
  5. Fill the hole around the wires with a piece of paper towel. This prevents drafts, which could affect the performance of the thermostat.
  6. Feed the wires through the base of the thermostat and screw it into position. If you're mounting the thermostat onto drywall, use the drywall anchors that came with the new thermostat kit.
  7. Attach the labeled wires to the corresponding terminals on the base. Be sure to follow wiring instructions carefully. Color codes may not apply.
  8. Attach the thermostat to the base.
Keep Reading

Next Up

Thermostats and Control Systems

They're no longer ugly, boring and hard to program. Some thermostats today are so automated, you can save energy without doing a thing.

How to Install French Drains

Divert groundwater from the basement or foundation with the help of gravel and fabric.

How To: Installing a Fire Pit

A backyard gets more warm and hospitable with a stone firepit.

How to Install Crown Molding

Install crown molding to add visual interest and value to your home.

How to Install Tile in a Bathroom Shower

Use these step-by-step instructions to take your shower from drab to fab by installing Italian marble tile.

How to Install Snap-Together Laminate Flooring

Installing snap-together flooring allows anyone with moderate DIY skills to create a beautiful new laminate floor.

How to Install a Planked Wood Ceiling

Add architectural detail and rustic, farmhouse charm to a builder basic bedroom with a tongue-and-groove planked wood ceiling. This is also a great way to cover up dated, cottage cheese ceilings or a sloppy drywall job.

How to Install a Carpet Runner on Stairs

A runner can add a splash of color to any room and make stairs more comfortable to walk on.

How to Install a Marble Tile Backsplash

Boost your kitchen's wow factor in a three-day weekend by installing a timeless Carrara marble backsplash in an updated subway tile pattern.

How to Install Wall-to-Wall Carpeting

The experts show how to install wall-to-wall carpeting.

On TV

Good Bones

6:30am | 5:30c

Container Homes

7:30am | 6:30c

Fixer Upper

8am | 7c

Fixer Upper

9am | 8c

Fixer Upper

10am | 9c

Fixer Upper

11am | 10c

Fixer Upper

12pm | 11c

Fixer Upper

1pm | 12c

Fixer Upper

2pm | 1c

Fixer Upper

3pm | 2c

Fixer Upper

4pm | 3c

Fixer Upper

5pm | 4c

Fixer Upper

6pm | 5c

Fixer Upper

7pm | 6c
On Tonight
On Tonight

Fixer Upper

8pm | 7c

Fixer Upper

9pm | 8c

House Hunters

10pm | 9c

Fixer Upper

11pm | 10c

Fixer Upper

12am | 11c

House Hunters

1am | 12c

Fixer Upper

2am | 1c

Fixer Upper

3am | 2c

Shop This Look

Found a living space you love in HGTV's Photo Library? Get the look in your own home with products from Wayfair.

Follow Us Everywhere

Join the party! Don't miss HGTV in your favorite social media feeds.