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Installing a Programmable Thermostat

Project Overview

Installing a Programmable Thermostat

Forget the stock market. Few hour-long home-improvement projects will pay year-in, year-out cost-saving dividends like replacing your old thermostat with a new programmable - or "automatic setback" - model. Depending on the severity of the winters where you live, you could realize a savings of up to 35 percent on your yearly energy bills.

8 Steps

  1. Turn off power
  2. Remove Thermostat Body
  3. Label Voltage Wires
  4. Remove Thermostat Base
  5. Thread Wires Through the New Thermostat
  1. Connect the Low-Voltage Wires
  2. Locate the Low-Voltage Transformer
  3. Install the Batteries
Show all steps »
Turn off power

Step 1

Turn off power

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

Remove Thermostat Body

Step 2

Remove Thermostat Body

Unscrew the thermostat mounting screws, and remove the thermostat body.

Label Voltage Wires

Step 3

Label Voltage Wires

Label the low-voltage wires to identify their screw-terminal locations using masking tape. Then disconnect the wires.

Remove Thermostat Base

Step 4

Remove Thermostat Base

Remove the thermostat base by loosening the mounting screws. Tape the wires to the wall to prevent them from slipping into the wall cavity.

Thread Wires Through the New Thermostat

Step 5

Thread Wires Through the New Thermostat

Thread the low-voltage wires through the base of the new thermostat. Mount the thermostat base on the wall using the screws included with the thermostat.

Connect the Low-Voltage Wires

Step 6

Connect the Low-Voltage Wires

Connect the low-voltage wires to the appropriate screw terminals on the thermostat base. Follow the installation diagram in your new thermostat's owner's manual.

Locate the Low-Voltage Transformer

Step 7

Locate the Low-Voltage Transformer

Locate the low-voltage transformer that powers the thermostat. The transformer usually is located near the heating/air-conditioning system or inside a furnace access panel. Tighten any loose wire connections, and make sure the wires and sheathing are in good condition.

Install the Batteries

Step 8

Install the Batteries

Install the battery or batteries in the thermostat body, and attach the body to the thermostat base. Restore power, and program the thermostat as desired.

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Project Details

Skill Level: Beginner

Time: 2 hours

Before you start, read this »

Due to differing conditions, tools, and individual skills, The Home Depot® assumes no responsibility for any damages, injuries suffered, or losses incurred as a result of attempting to replicate any of the home improvement ideas portrayed in this website Before beginning any home improvement project, review it thoroughly to ensure you or your contractor can finish the project and if any doubts or questions remain, consult local experts or authorities. Because codes and regulations vary greatly, you always should check with authorities to ensure that your project complies with all applicable local codes and regulations. Always read and observe all of the safety precautions provided by any tool or equipment manufacturer, and follow all accepted safety procedures.

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