Furnace Repair Cost Guide
Furnace repair costs range from $100–$500 for common issues. Ignitor replacement costs $150–$300, blower motor $300–$600, and heat exchanger repair $500–$1,500.
Costs depend on the failed component and furnace type (gas, electric, or oil).
Common Furnace Repairs & Costs
Diagnostic / Service Call$75–$150
Ignitor Replacement$150–$300
Blower Motor Replacement$300–$600
Gas Valve Replacement$200–$600
Heat Exchanger Repair$500–$1,500
Full Furnace Replacement$2,500–$6,000
What Affects Furnace Repair Costs?
Understanding what drives the price helps you avoid overpaying — and know when a quote is reasonable.
Component type — Ignitor replacement is the most common fix at $150–$300. Blower motors run $300–$600. Heat exchanger repair is the costliest at $500–$1,500.
Furnace fuel type — Gas furnaces are most common with the widest parts availability. Oil furnaces may need specialized technicians. Electric furnaces have fewer mechanical parts but different repair profiles.
System age — Furnaces last 15–25 years. Units over 20 years old may need discontinued parts, increasing cost and repair time. If repairs exceed 50% of replacement cost ($2,500–$6,000), replacement is usually smarter.
Season and urgency — Winter emergency calls during cold snaps carry the highest premiums (1.5–2× standard rates). Scheduling fall maintenance prevents most mid-winter breakdowns.
Signs Your Furnace Needs Repair
Most homeowners don't replace until something goes wrong. Watch for these warning signs:
- Yellow or flickering pilot light (should be blue)
- Furnace cycles on and off frequently
- Cold air blowing from vents
- Unusual smells (rotten egg = gas leak, call immediately)
- Carbon monoxide detector alerts
- Excessive dust or dry air in the home
- Rising gas bills with no change in usage
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