🔧 Furnace Repair

Furnace Repair: What It Costs, the Cracked-Heat-Exchanger Scam, and Who to Trust

Honest price ranges for furnace no-heat diagnostics, flame-sensor and igniter swaps, gas-valve and control-board repairs, and heat-exchanger replacement — plus how to spot a cracked-heat-exchanger condemnation used to sell a new furnace, and reviewed local technicians with NATE certification and combustion-safety method. Listings cover 0 states and 0 cities — each provider scored out of 100 on the Vouched Score, blending public-record signals, customer reviews, and editorial assessment. See methodology →

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Typical Furnace Repair pricing (2026)

Last updated June 21, 2026

Median Furnace Repair technician wage: $67,060/yr nationally.Source: U.S. Bureau of Labor Statistics OEWS 2024 (SOC 49-9021).

Estimated typical ranges. Actual cost varies with home size, equipment, and scope — always request a written quote for your job.

ServiceTypical range
Furnace service call / diagnostic fee$75–$200
Flame sensor cleaning / replacement$80–$250
Hot surface igniter replacement (installed)$150–$450
Furnace gas valve replacement (installed)$300–$750
Draft inducer motor replacement (installed)$300–$800
Furnace control board replacement (installed)$400–$900
Heat exchanger replacement (repair-vs-replace inflection)$1,000–$3,500
Emergency / after-hours no-heat service premium$150–$500

Furnace Repair FAQ

Do furnace repair companies need a license?
Yes — furnace repair is licensed mechanical work, and because it involves gas-fired combustion appliances it carries extra safety weight. Texas regulates it through TDLR's Air Conditioning & Refrigeration (ACR) program and Arizona through the Registrar of Contractors; both expect a licensed contractor plus general liability insurance. Gas-line and gas-appliance work is separately regulated in most jurisdictions. An unlicensed 'handyman furnace repair' working on a gas appliance is the single biggest red flag — verify the state license before hiring.
What does NATE certification mean for a furnace technician?
NATE (North American Technician Excellence) is the leading voluntary competency certification, and a furnace-specific NATE specialty (Gas Heating, Air Distribution) signals a tech trained on combustion appliances rather than a cooling-only generalist. Manufacturer-authorized status (Carrier, Trane, Lennox, Goodman, Rheem) matters too — it preserves the warranty on high-stakes parts like the heat exchanger and reflects factory training. Ask to see both.
Why is a cracked heat exchanger such a big deal?
The heat exchanger is the metal wall that keeps combustion gases — including carbon monoxide — separate from the warm air blown into your home. A genuine crack can leak CO, so it's a real safety issue. But it's also the part most often falsely condemned to sell a whole new furnace, because most homeowners can't see it. An honest shop documents a suspected crack with a combustion analyzer (measuring CO) and a camera or visual inspection before recommending replacement.
How can I tell a real furnace specialist from a guesser?
A specialist measures combustion: carbon-monoxide levels, draft, gas pressure (with a manometer), and temperature rise across the heat exchanger — not just 'it lights, you're fine.' Proper diagnosis isolates the actual failed part (flame sensor, igniter, gas valve, pressure switch, control board) instead of jumping to 'you need a new furnace.' If the visit is a five-minute look with no instruments, get a second opinion.
How do I avoid common furnace repair scams?
The most common one is a 'cracked heat exchanger' condemnation used to sell a full replacement without showing you proof or a CO reading. Be wary of any tech who red-tags a furnace without a documented combustion test, of '$49 tune-up' offers used to upsell unneeded parts, and of a quote to replace expensive components (control board, gas valve) before the cheap, common failures (flame sensor, igniter) are ruled out. Insist on a written, flat-rate diagnosis and an explanation before you authorize any major part.

Last updated June 21, 2026.