Thermostat replacement cost: $114 to $265, smart install

National figures. The thermostat type, whether a C-wire exists, and who does the work (HVAC tech or electrician) move the price.

How much does thermostat replacement cost?

Thermostat replacement costs $114 to $265 installed in HomeAdvisor's June 2026 data, $184 on average, and $140 to $350 in HomeGuide's guide with a $229 average. The full range runs $67 to $500 (HomeAdvisor).

Labor is most of it. HomeAdvisor prices a licensed electrician at $65 to $100 an hour for 1 to 3 hours, $65 to $300 in all; HomeGuide lists an HVAC company at $50 to $150 an hour or an electrician at $50 to $130, for 30 minutes to 3 hours. A like-for-like swap on existing wires sits at the bottom of the range.

Thermostat cost by type: manual to smart

The unit itself runs from $15 for a manual dial to $300 for a smart thermostat in HomeAdvisor's figures, and HomeGuide's installed totals climb the same ladder.

HomeAdvisor says whole-home smart systems can pass $1,000. HomeGuide's page gives different smart unit prices in two places ($100 to $250 in text, $150 to $320 in its table).

Smart thermostat installation cost

Smart thermostat installation costs $200 to $450 installed in HomeGuide's guide, or $225 to $400 for the labor and a mid-priced unit, and HomeAdvisor says a smart thermostat can cut heating and cooling bills by 10% to 15%, about $140 a year.

HomeAdvisor (Jun 2026) unit prices; HomeGuide (Aug 2025) installed ranges. HomeGuide's Nest total appears as both $250 to $450 and $269 to $449 on its page.

• The C-wire. Most smart thermostats want a common wire for power. HomeAdvisor and HomeGuide both price a new C-wire at $90 to $135, and HomeAdvisor adds up to 2 labor hours ($130 to $200). Count the wires behind the old plate before you buy.
• Multizone or heat pump systems. HomeAdvisor says multizone work needs both an HVAC professional and an electrician. A heat pump with backup heat uses more wires than a furnace; check the thermostat's compatibility checker first.
• Utility rebates. Mass Save pays up to $100 per smart thermostat (limit 3), Con Edison $85 per enrolled thermostat with central AC, and Xcel Energy Minnesota $50. Most require enrolling in a demand-response program; ask your utility.
• Drywall. A bigger or smaller plate can leave a mark: HomeAdvisor and HomeGuide price a patch at $75 to $150.

Thermostat replacement by system: furnace, boiler, heat pump

A furnace thermostat replacement runs $190 to $480 and a boiler thermostat $280 to $480 in HomeGuide's appliance table, higher than the general range because the labor side is priced at $150 to $400.

• Furnace or central AC: HomeGuide lists $190 to $480 (furnace) and $120 to $200 (AC). The general $140 to $350 range covers a standard low-voltage swap on either.
• Boiler: $280 to $480 (HomeGuide). Zone valves and multiple thermostats add time.
• Heat pump: HomeAdvisor's heat pump repair guide prices a thermostat at $100 to $300 and HomeGuide's heat pump guide a diagnostic at $75 to $200. Carrier notes a thermostat left on cool or constant fan is a common reason a heat pump blows cool air.
• Line-voltage baseboard or wall heaters: HomeGuide lists the unit at $30 to $85 and labor at $200 to $400. This is electrician work; see electrician cost.

Signs a thermostat is the problem, and when it is not

A thermostat repair costs about $210 in HomeAdvisor's figures, so the first checks are free ones:

• Batteries and settings. Trane says dying batteries, calibration and placement near vents, heat sources or direct sunlight can make a furnace short cycle. Lennox says battery-only thermostats can malfunction on low batteries.
• Mode. Heat or cool, fan on auto (Carrier).
• Blank screen with fresh batteries. Could be the thermostat, could be the furnace's low-voltage fuse or a tripped float switch on the AC. A technician checks both.
• Rooms heat unevenly. Usually ducts or zoning, not the thermostat; see ductwork replacement cost.
• Furnace short cycles with a good thermostat. See furnace short cycling.

Moving a thermostat

Moving a thermostat costs $135 to $450 in HomeGuide's guide, by distance: $135 to $250 for 10 feet, $195 to $350 for 20 feet and $255 to $450 for 30 feet, with wiring at $6 to $10 per foot. Trane's advice to keep the thermostat central and away from vents and sun is the usual reason to move one.

Thermostat installation near me: what to ask

• HVAC company or electrician? Either does a low-voltage swap; line-voltage heaters are electrician work.
• Is there a C-wire, and what if not? $90 to $135 for a new one (HomeAdvisor, HomeGuide).
• Is the thermostat compatible with my system? Heat pumps with auxiliary heat and multistage furnaces need the right model.
• Flat price or hourly? $50 to $150 an hour (HomeGuide).
• Will you set up the app and schedule? That is where the 10% to 15% savings come from (HomeAdvisor).
• License number and proof of insurance. Ask for the company's license number and proof of insurance yourself; the HVAC license table shows who licenses HVAC work by state.

The thermostat is often blamed for a furnace or AC fault; the real list is on furnace repair and AC not turning on. Rebates on bigger upgrades: heat pump rebates. More: HVAC repair and home repair costs. Calls go to an independent heating and cooling company that serves your area and takes this kind of job; hours vary. How calls work.