Guide
Furnace Repair Cost: What Each Fix Costs in 2026
Published October 2026 · 2026 dollars
The short answer
Most furnace repairs cost $133–$505, with a national average around $318 (Angi, 2026). Small parts like flame sensors and ignitors sit at the cheap end; blower motors and heat exchangers sit at the expensive end. If the quote is big and the furnace is old, compare it against the cost of a new furnace before saying yes.
Repair cost by part
These are 2026 national ranges including parts and labor (Angi). Where your job lands depends on the exact part, your furnace model and local labor rates.
| Part | Typical cost (2026) | Notes |
|---|---|---|
| Flame sensor | $150–$250 | One of the most common, cheapest fixes — often just needs cleaning |
| Ignitor (hot surface ignitor) | $150–$500 | Frequent failure on modern gas furnaces |
| Thermostat | $100–$600 | Sometimes the problem isn't the furnace at all |
| Relay switch | $150–$300 | Small electrical part, quick job |
| Transformer | $100–$175 | Powers the low-voltage controls |
| Gas valve | $200–$600 | Controls fuel flow to the burners |
| Circuit / control board | $200–$600 | The furnace's brain; moderate labor |
| Burners | $150–$450 | Cleaning or replacement |
| Flue pipe | $400–$800 | Venting section replacement |
| Draft inducer motor | $200–$1,500 | Commonly fails around 10–15 years |
| Blower motor | $150–$2,000 | Wide range — simple motors to variable-speed units |
| Heat exchanger | $100–$1,500 | The big one; on an older furnace this often ends the repair conversation |
What else ends up on the bill
- Diagnostic / service-call fee: roughly $75–$200, often credited toward the repair if you proceed (CostInspector).
- Emergency or after-hours work: surcharges on top of standard rates (CostInspector).
- Parts availability: older or discontinued models can mean pricier parts and longer waits.
- Local labor rates: the same repair costs more in high-cost metro areas. We don't adjust for your city — we haven't found defensible public data for local rates.
Repair or replace?
A repair is usually the right call when the furnace is relatively young, the fix is a common cheap part, and it has been reliable otherwise. Replacement starts to win when the repair is a major component, the furnace is past the middle of its expected life, or repairs are becoming a yearly habit.
One widely used heuristic is the $5,000 rule: multiply the furnace's age in years by the repair quote. If the result is over $5,000, replacement is usually the better investment (CostInspector). It's a rule of thumb, not a law — a 12-year-old furnace with a $450 ignitor quote ($5,400) can still be worth fixing if it's otherwise healthy.
Put a number on the other option
The repair quote only makes sense next to the replacement price. Our furnace replacement cost calculator gives a 2026 national planning range for a new installed furnace by fuel type, size and efficiency — so you can see whether a $1,200 repair is a third of a new furnace or a tenth of one.
Safety comes first
Gas, propane and oil furnaces are combustion appliances. If you smell gas, if a carbon monoxide alarm goes off, or if a technician tells you the heat exchanger is cracked, stop using the furnace and get professional help. Combustion appliances should be professionally installed and maintained, and every home with them needs working CO alarms (EPA).
Frequently asked questions
What is the average furnace repair cost in 2026?
Angi's 2026 data puts the national average at about $318, with most homeowners paying $133–$505 (Angi). The failed part matters more than anything else.
How much is the service call or diagnostic fee?
Expect roughly $75–$200 for the visit itself; many companies credit it toward the repair if you go ahead (CostInspector). Ask before booking.
Why do emergency repairs cost more?
After-hours, weekend and holiday calls typically carry a surcharge on top of the standard rate (CostInspector). If it's not a safety issue and you have another heat source, a regular appointment is usually cheaper.
Is it worth repairing a 15-year-old furnace?
Often not for a major part. A common heuristic is the "$5,000 rule": multiply the furnace's age by the repair quote — over $5,000 suggests replacement. Also weigh the repair against what a new furnace costs installed (our replacement cost calculator gives a planning range).
Should I repair or replace if the heat exchanger is cracked?
A cracked heat exchanger is a safety issue — it can leak combustion gases, including carbon monoxide, into your air (EPA). Stop using the furnace and get a professional assessment. On an older unit, replacement usually makes more sense than this repair.
Can I fix a furnace myself to save money?
Changing a filter or checking the thermostat batteries, yes. Anything involving gas, burners, venting or wiring should be left to a licensed professional — combustion appliances that are installed or repaired incorrectly can produce carbon monoxide.
How do I avoid overpaying for a furnace repair?
Get the diagnosis in writing, ask for the part and labor broken out, and get a second quote for anything over a few hundred dollars. Be cautious if a company pushes straight to replacement for a cheap, common failure.
Does a yearly tune-up really save money?
A tune-up runs about $150–$200 a year and can catch small problems before they become no-heat emergencies (Angi). It also keeps combustion appliances checked, which matters for safety.
Keep going
- Furnace replacement cost calculator
- Furnace size calculator
- High-efficiency furnaces: what to know
- Heat pump vs furnace
- Every source we used
Educational information only — not advice from a licensed HVAC contractor. Ranges are national planning figures, not quotes. Listing a source doesn't mean it endorses FurnaceCalculator.com.