Furnace repair cost is the first number homeowners want when something goes wrong — but the more important question is whether repair or replacement makes better financial sense.
What Furnace Repairs Typically Cost
- Minor repairs (igniter, thermocouple): $150–$400
- Mid-range (control board, inducer motor): $400–$800
- Major (heat exchanger): $1,500–$2,500
The 50% Rule
If repair cost exceeds 50% of the system's current value, replacement is usually smarter. A 15-year-old furnace worth $800 shouldn't receive a $600 repair.
Age Matters
- Under 10 years: almost always worth repairing
- 10–15 years: do the math carefully
- Beyond 15 years: most repairs are buying time
What Replacement Gets You
Modern furnaces run at 95–98% AFUE vs 70–80% in older units. Energy savings can offset replacement cost over 5–7 years.
Don't Overlook Incentives
Federal tax credits can offset up to $600 of a furnace replacement.
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Full guide: How Much Does Furnace Repair Cost?
