How to install a smart thermostat

Difficulty Intermediate Time 2-3 hours Materials $110–$275 Steps 6
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Intermediate2-3 hours
Always turn off power to the HVAC system before starting.
Do it yourself
$110–$275
parts & materials, about 2-3 hours of your time
Hire a pro
$150–$300
typical all-in price
Rough estimates for guidance only — actual costs vary by job, materials and local prices. Get real quotes.

Tools you'll need

screwdriverdrilllevel

Parts & materials

Smart thermostat
Typically need: 1
$100-$250
per each
Wire connectors
Typically need: 1
$5-$10
per pack
Wall plate (if needed)
Typically need: 1
$5-$15
per each

Estimated materials total: $110–$275. Prices vary by region and retailer.

Step by step

  1. 1 Turn off power to the HVAC system Locate the circuit breaker for your HVAC system and turn it off to ensure safety while working. 10 min
  2. 2 Remove the old thermostat Unscrew and disconnect the wires from the old thermostat. Take a picture of the wiring for reference. 20 min screwdriver Be careful not to let the wires touch each other.
  3. 3 Install the new thermostat base Attach the new thermostat base to the wall using the provided screws and ensure it is level. 15 min drilllevel
  4. 4 Connect the wires to the new thermostat Using the reference photo, connect the wires to the corresponding terminals on the new thermostat. 15 min screwdriver Double-check the connections to avoid short circuits.
  5. 5 Attach the thermostat faceplate Snap the faceplate of the thermostat onto the base once the wiring is complete. 5 min
  6. 6 Restore power and configure the thermostat Turn the circuit breaker back on and follow the manufacturer's instructions to configure your new thermostat. 30 min

Permits, safety & disposal

Safety rules
  • Always turn off power to the HVAC system before starting.
  • Follow the manufacturer's installation instructions carefully.
Legal disposal
  • Dispose of the old thermostat according to local electronic waste disposal guidelines.
Check locally

Check with the Naperville building authority for any specific local requirements.

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This guide is AI-generated for general help and may not fit your exact situation. Know your limits — when in doubt, hire a licensed pro.

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