Furnace Repair Cost

How Much Does It Cost to Fix a Furnace?

On average, a typical furnace repair costs around $600, with most jobs falling between $350 and $900. Your price depends on the failed part, how easy it is to access, and local labor rates. For non-emergency weekday visits, expect costs near the middle of that range.

Low, Mid, and High Range Costs

• Low (Minor Repair): $150 to $350. Examples include cleaning a flame sensor, replacing a thermocouple, or swapping an igniter.
• Mid (Several Parts or More Labor): $350 to $750. Examples include draft inducer motor, control board, or multiple small parts in one visit.
• High (major repair): $750 to $2,000+. Examples include variable-speed blower motor or a cracked heat exchanger. At this level, compare repair versus full furnace replacement.

Furnace Repair Cost by Part

The prices below are national averages and include parts and labor unless noted. Actual costs vary by brand, availability, and access.

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Flue Pipe Replacement

Expect to pay $300 to $800 for a flue pipe replacement. The price goes up if the vent run is long, the technician needs attic or roof access, or your high-efficiency furnace needs extras — like hangers, roof flashing, or a small drain for condensate.

Heat Exchanger

Expect to pay $1,500 to $3,500 if your furnace repair cost involves replacing a heat exchanger. The heat exchanger is often the most expensive repair on a gas furnace. A cracked heat exchanger is a safety issue that can allow carbon monoxide into your home. Replacement is essential, and a full system replacement may make more financial sense for older units.

Thermocouple Replacement

Expect to pay $100 to $250. Thermocouple replacement is common on older standing-pilot furnaces. Newer furnaces use flame sensors or hot-surface igniters.

Additional Common Parts

• Igniter: $150 to $350
• Flame Sensor (Clean or Replace): $100 to $300
• Pressure Switch: $150 to $350
• Limit Switch: $150 to $300
• Gas Valve: $300 to $600
• Control Board: $400 to $800
• Inducer (Draft) Motor: $400 to $900
• Blower Motor (PSC): $450 to $900
• Blower Motor, Variable-Speed/ECM: $700 to $1,500
• Thermostat, Installed: $150 to $500

Definitions: PSC = permanent split capacitor (standard motor). ECM = electronically commutated motor (high-efficiency, variable-speed).

Furnace Inspection Cost

Expect to pay $75 to $150 for a diagnostic visit. Many companies credit or waive this fee if you approve the repair.

Repair Cost by Furnace Type

Different fuel types have different parts and service needs, which affects price.

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Cost per Hour

Expect $75 to $150 per hour for labor, plus a typical $100 to $250 diagnostic minimum. Nights, weekends, and holidays often add an emergency premium.

Furnace Tune Up Cost

A routine tune-up typically costs $80 to $200. This visit helps prevent breakdowns and can keep your warranty valid.

What’s usually included: Safety checks for gas leaks and carbon monoxide, burner and flame sensor cleaning, heat exchanger inspection, electrical tests, verification of gas pressure, temperature rise and airflow, and filter service if provided.

What Affects Furnace Repair Costs?

• Part and Complexity: Specialty parts and variable-speed (ECM) components cost more.
• Age and Brand: Older units or top furnace brands may have pricier or harder-to-find parts.
• Access and Code Upgrades: Tight spaces, vent changes, or permits add time, which increases your furnace repair costs.
• Emergency Timing: After-hours service costs more.
• Warranty Status: Parts may be covered. Labor usually isn’t unless you purchased extended coverage.
• Location: Local labor rates and permit fees vary.

Furnace Repair Cost Q&A

These quick answers cover the most common questions homeowners ask before approving a repair.

What is the most expensive repair on a furnace?

You’ll usually pay the most for a heat exchanger at $1,500 to $3,500. Because of safety and cost, many homeowners consider full replacement when this fails on an older unit.

Is it worth fixing a furnace?

Often, yes, especially for repairs under $900 on a unit under 12 years old (or still under warranty). If the repair is large and the furnace is near end of life, hvac replacement may offer better reliability and efficiency.

What is the most expensive part to fix on a furnace?

The heat exchanger. Close behind are variable-speed (ECM) blower motors and some control boards.

Is it cheaper to repair or replace a heater?

Repair is cheaper for minor or mid-range issues. Replace the entire unit when the heat exchanger fails, repairs exceed 30% to 40% of the cost of a new system, or your furnace is nearing the end of its typical lifespan.

Ready for Warmth: Find a Trusted Furnace Pro

Furnace problems are stressful, but a clear estimate and a qualified pro make the fix straightforward. Compare two to three written quotes, ask for itemized pricing, and request warranty terms in writing — parts and labor. Modernize can connect you with vetted local pros, so you can solve the issue quickly and confidently.

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