Furnace Repair Cost in 2026: Prices by Part & Problem

When a furnace quits on a cold night, the first question is cost. The short answer: most furnace repairs cost $150–$1,500 in the US in 2026, with a typical bill around $300–$350. Ignition parts are cheapest; blower motors and heat exchangers cost most — and one often means pricing a replacement.

Quick Answer: Furnace Repair Cost by Part

Most furnace repair bills come down to which part failed:

Part or repair	Typical cost (2026)	Notes
Flame sensor replacement	$150–$250	Cleaning may be cheaper
Ignitor replacement	$150–$400	Most common
Thermostat replacement	$100–$600	Smart costs most
Gas valve replacement	$200–$600	Licensed tech only
Control board replacement	$200–$600	Varies by brand
Draft inducer motor	$200–$1,500	Brand/access vary
Blower motor replacement (standard)	$300–$800	ECM motors: $900–$2,000
Heat exchanger replacement	$500–$1,500	Some quotes run $1,000–$3,000
Diagnostic / service call fee	$75–$150	Often waived or credited with repair

Angi puts the average at about $318; HomeGuide at about $300, with most repairs between $125 and $480. The diagnostic fee is often waived or credited if you approve the work — ask before booking. For a simple-part quote far above the table, request a written part-and-labor breakdown.

Heat-exchanger warning: A cracked heat exchanger is replaced, never repaired, because cracks can leak combustion gases, including carbon monoxide. Quotes vary widely ($500–$1,500 in Angi’s data; $1,000–$3,000 in HomeGuide’s), so on an out-of-warranty furnace, treat it as a replacement decision.

What Changes the Price

• Part: Flame sensor: $150–$250; heat exchanger: far more.
• Motor type: Standard blower: $300–$800; variable-speed ECM: $900–$2,000.
• Age and parts: Parts for 15–20-year-old models may be discontinued or slow to source.
• Brand: Premium brands and proprietary control boards cost more.
• Timing: Nights, weekends, holidays, and cold snaps carry emergency pricing.
• Warranty: Parts may have 5–10-year coverage; labor usually does not.

Repair vs Replace: Run the $5,000 Rule

Multiply the repair quote by furnace age. Over $5,000, lean replacement; under it, repair usually wins. Also replace if the repair exceeds half the installed price of a comparable new furnace, typically $3,500–$8,000 — see furnace replacement cost.

Worked example: A 14-year-old furnace needs a $650 blower motor: 14 × $650 = $9,100, so lean replace, despite $650 being only about 10–18% of replacement. On a 6-year-old furnace, the same quote gives $3,900, so repair it. Small fixes still make sense under 12: 12 × $300 = $3,600.

If major repairs keep coming, also price a heat pump installation cost instead of a like-for-like furnace. Safety: Gas valves, heat exchangers, venting, and ignition work are licensed-technician jobs — not DIY — and reputable repairs end with combustion and carbon-monoxide checks.

How to Save Money on Furnace Repair

• Confirm whether the diagnostic fee is waived/credited with repair.
• Get a written, flat-rate quote and part-and-labor split before work starts.
• Get a second opinion on any quote over $1,000, especially a heat-exchanger diagnosis.
• Check warranty coverage first; covered parts still leave diagnostic and labor costs.
• Annual tune-ups (about $150–$200) and filter changes every 90 days help prevent emergency failures.
• If replacing, check state and utility rebates. The federal Section 25C energy-efficiency tax credit ended on December 31, 2025, so it no longer applies to 2026 work.

In Canada: Furnace Repair Costs (CAD)

From HomeStars’ 2026 Canada guide: diagnostic C$80–$150; ignitor C$150–$300; flame sensor C$75–$200; blower motor C$300–$650; gas valve C$300–$700; control board C$400–$900; heat exchanger C$500–$1,500+. Diagnostic fees are commonly credited toward approved repairs; the same age × quote rule applies with a C$5,000 threshold.

Worked Example: What an Ignitor Repair Bill Looks Like

The table above calls the ignitor the most common furnace repair. Say that’s your failure — here is the visit priced out both ways, depending on how the company treats its diagnostic fee:

• Ignitor replacement (part and labor): $150–$400
• Diagnostic / service call fee: $75–$150
• Total if the fee is charged on top: $150 + $75 = $225 at the low end; $400 + $150 = $550 at the high end — so $225–$550
• Total if the fee is credited toward the repair (many companies do): just the $150–$400 repair itself

Either way, the bill sits well inside this guide’s $150–$1,500 typical range — and on a furnace under about 12 years old, the $5,000 rule above points to repairing: even at the top of the ignitor range, 12 × $400 = $4,800.

Red Flags in a Furnace Repair Quote

• A cracked heat exchanger with no evidence. You’re urged to replace it — a safety-critical call — but shown no photo or camera proof. Get a second opinion, as the savings section advises on any quote over $1,000.
• No part-and-labor split. One number for the whole repair, with no written breakdown of what the part costs versus the labor.
• Diagnostic fee terms kept vague. Nobody says whether the $75–$150 fee is waived or credited if you approve the repair — until it lands on the bill.
• “Today only” pressure. A big repair quote that expires if you sleep on it, in the middle of a cold snap.
• No safety check mentioned. The quote ends at the repair — no combustion or carbon-monoxide check after gas or ignition work.

Questions to Ask Before You Hire

• Is the diagnostic fee waived or credited if I approve the repair?
• Can I get the part-and-labor split in writing before work starts?
• Is the failed part still under warranty — and what would I still owe for labor?
• Will you run combustion and carbon-monoxide checks after the repair?
• At my furnace’s age, would you repair or replace — and what does the math look like?

How Furnace Repair Costs Vary by Region

A furnace part is a national product; the technician’s hour is not, so repair bills follow local labor markets and the calendar. Winter is the expensive season everywhere — as the factors above note, nights, weekends, holidays and cold snaps carry emergency pricing, so the same ignitor costs more during a January cold snap than in October. Canada runs on its own scale entirely: most repairs run C$150–C$900 (see the Canada section above), with diagnostic fees of C$80–$150 commonly credited toward an approved repair.

Sources + How We Built This Range