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Smart thermostat installation cost
Smart thermostat installation runs $150–$400 plus the device. The one real snag is the C-wire — if your wall doesn't have one, use the power-extender kit most major brands include, or have a pro run one for $100–$200.
Price at a glance
| Item | Typical |
|---|---|
| Job price range | $150–$400 |
| Common variants | Device $100–$300 extra; C-wire adapters included in the better ones |
| Labor share | 1 hour typical |
| Permit | No |
| Duration | 30–60 min |
National job price data from the ee.ltd cost database, 2026 edition.
What drives the price
- C-wire availability
- Multi-stage vs single-stage system
- Heat pump compatibility (O/B wire)
- Zoned systems need more wiring thought
DIY verdict
Very DIY-able — low-voltage wiring, breaker off for safety
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