HVAC cost guide
Furnace Repair Cost in 2026: Gas & Electric Heating Repairs
Furnace repairs typically cost $150 to $650 (about $350 on average). Compare ignitors, flame sensors, gas valves, control boards, and service fees.
Last reviewed: October 2026
Cost Snapshot
$150 – $650
Most homeowners spend between $150 and $650 for a professional furnace repair, averaging $350. Routine mechanical component replacements such as hot surface ignitors ($150–$350) or flame sensors ($100–$250) fall on the lower end. Major component failures like a cracked heat exchanger ($1,400–$2,800) or integrated control board ($250–$650) approach or exceed the cost of replacing the entire furnace.
Typical planning range based on the published references reviewed for this guide. Use it to prepare questions and compare written, itemized contractor proposals. Actual costs vary with project scope, materials, access, permits, and local conditions.
Parts vs. Labor Breakdown
| Component | Typical range | What it covers |
|---|---|---|
| Materials / equipment | $45 – $320 | OEM or universal replacement parts: silicon nitride hot surface ignitor, flame sensor rod, 24V gas control valve, pressure switch, or electronic control board. |
| Labor | $95 – $300 | Diagnostic checkout, combustion gas analysis, static pressure measurement, electrical multimeter testing, part swap, and safety shutdown testing. Benchmark: BLS reports a May 2025 national median wage of $29.33 per hour for HVAC technicians (heating, air conditioning, and refrigeration mechanics and installers) (10th to 90th percentile: $19.25 to $45.78). That is what an employee earns; the hourly rate used here is what a contractor bills, which also covers insurance, equipment, overhead, and margin. |
| Permits | $0 – $100 | Municipal permits are rarely required for standard part replacements, though full heat exchanger or gas valve replacements in select cities require mechanical sign-off. |
| Disposal | $0 – $50 | Disposal of defective furnace components handled under general service truck inventory. |
| supplies additional | $10 – $30 | Wire terminals, high-temp silicone, flame roll-out switch wiring, and combustion chamber gaskets. |
Cost by Capacity & Scope
| Size / scope | Typical coverage | Estimated installed cost | Average |
|---|---|---|---|
| Minor Diagnostic & Sensor Cleaning | Flame sensor cleaning or fuse replacement | $85 – $220 | $150 |
| Standard Part Replacement | Ignitor, pressure switch, or capacitor | $150 – $400 | $275 |
| Intermediate Mechanical Repair | Gas valve, draft inducer motor, or circuit board | $300 – $750 | $520 |
| Major Overhaul / Critical Safety | Cracked heat exchanger replacement | $1,400 – $2,800 | $1,850 |
Cost by Repair Type
| Type | Spec | Typical cost | Details |
|---|---|---|---|
| Hot Surface Ignitor Replacement | Most Frequent Repair | $150 – $350 installed | Replaces brittle ceramic ignitor that glows red-hot to light burners; failure prevents furnace from firing. |
| Flame Sensor Rod Cleaning or Swap | Common Safety Lockout | $100 – $250 installed | Safety sensor detecting burner ignition. If coated with carbon, the furnace shuts down after 3–5 seconds. |
| Draft Inducer Exhaust Motor | Mechanical Component | $350 – $750 installed | Small blower fan venting combustion exhaust gases outdoors before burners ignite. |
| Main Control Circuit Board | Electronic Controller | $250 – $650 installed | Microprocessor motherboard governing timing, safety interlocks, and blower motor stages. |
| Gas Valve & Regulator Assembly | Gas Pressure Critical | $250 – $600 installed | Electromagnetic valve regulating natural gas or propane manifold pressure entering burners. |
Additional Line Items Often Needed
| Item | Typical cost | Necessity | Notes |
|---|---|---|---|
| Diagnostic / Service Call Fee | $75 – $150 | Required | Standard fee for technician dispatch and troubleshooting; often applied toward repair if approved. |
| Emergency After-Hours Heating Dispatch | $125 – $250 | Optional | Surcharge for freezing temperatures, weekends, holidays, or emergency night service. |
| Programmable / Smart Thermostat Replacement | $150 – $350 | Optional | Often recommended when intermittent furnace failure stems from faulty 24V thermostat wiring. |
Frequently Asked Questions
How much does it cost to repair a gas furnace in 2026?
Most gas furnace repairs cost between $150 and $650, with $350 being the national average. Simple fixes like replacing a flame sensor or ignitor cost $150 to $350, while control boards or gas valves cost $250 to $650.
Is it worth repairing a 15-year-old furnace?
The general HVAC rule of thumb is the $5,000 rule: multiply the age of the furnace by the repair cost. If the result exceeds $5,000, replacing the unit is more cost-effective. A $600 repair on a 15-year-old furnace ($9,000) strongly favors replacement.
What is the most expensive furnace repair?
Replacing a cracked heat exchanger is the most expensive furnace repair, costing $1,400 to $2,800. Because a cracked heat exchanger presents a serious carbon monoxide hazard and often occurs on older units, HVAC professionals usually recommend full furnace replacement ($2,800–$6,500).
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How we estimate these planning ranges and the sources we review.