Updated October 2026. Furnace repair in the Seattle area usually costs $139 to $544, with an average of $341 (regional estimate, Angi Seattle, updated August 2026). Small parts like flame sensors and ignitors keep most bills in that range; motors, control boards and heat exchangers cost more.
At Home Comfort Alliance, the dispatch fee is $119, a standard diagnostic is $72, and you approve an upfront price before any work begins. If you need a technician now, see furnace repair in Seattle-Tacoma.
Furnace repair cost at a glance
Repairs fall into three rough tiers. Small electrical and ignition parts are the cheapest; motors and controls sit in the middle; heat exchanger and flue work costs the most.
| Tier | Typical parts | Seattle cost range |
|---|---|---|
| Minor | Flame sensor, ignitor, thermostat, relay switch, transformer | $110 to $650 |
| Mid | Control board, gas valve, draft inducer motor, blower motor | $160 to $2,160 |
| Major | Heat exchanger, coils, flue pipe | $110 to $2,160 |
Regional estimate, Angi Seattle, updated August 2026. Not Home Comfort Alliance prices.
What Home Comfort Alliance charges
| Fee or service | Price |
|---|---|
| Dispatch (trip) fee | $119 |
| Standard diagnostic | $72 |
| Deeper diagnostic | $130 |
| After-hours fee | $330 |
| Ignitor replacement | $353 to $821 |
| Thermostat replacement | $299 to $1,840 |
| Furnace tune-up | $230 ($180 for Club members) |
| Oil furnace tune-up | $336 ($288 for Club members) |
Prices as of September 2026; oil furnace tune-up as of October 2026.
Each fee is listed on its own. We don’t bundle or combine them, and you see the repair price before we start. Our trucks are fully stocked, so most repairs can be handled on the spot.
Furnace repair cost by part
This table puts Angi’s Seattle and national figures side by side with our own prices where we publish one. Everything else is quoted after the technician finds the cause.
| Part | What it does | Common symptom | Seattle (Angi, Aug 2026) | National (Angi, Sep 2026) | Home Comfort Alliance |
|---|---|---|---|---|---|
| Flame sensor | Proves the burner flame is lit | Burners light, then shut off | $160 to $270 | $150 to $250 | Quoted after diagnosis |
| Ignitor | Lights the gas burners | Furnace clicks or tries to start but never lights | $160 to $540 | $150 to $500 | $353 to $821 |
| Thermostat | Tells the furnace when to run | No call for heat, or wrong temperatures | $110 to $650 | n/a | $299 to $1,840 |
| Relay switch | Switches power to parts of the furnace | Blower or burners won’t switch on | $160 to $330 | $150 to $300 (relay or high limit) | Quoted after diagnosis |
| Transformer | Supplies low-voltage power to the controls | Furnace completely dead, no lights on the board | $110 to $190 | n/a | Quoted after diagnosis |
| Circuit (control) board | Runs the furnace’s start-up sequence | Error codes, erratic starts | $220 to $650 | $200 to $600 | Quoted after diagnosis |
| Gas valve | Opens and closes the gas supply to the burners | Ignitor glows but no flame | $220 to $650 | $200 to $600 | Quoted after diagnosis |
| Draft inducer motor | Pushes exhaust out of the flue | Loud hum or rattle, furnace won’t start | $220 to $1,620 | $200 to $1,500 | Quoted after diagnosis |
| Blower motor | Moves warm air through the ducts | Burners run but little or no air from vents | $160 to $2,160 | $150 to $2,000 | Quoted after diagnosis |
| Burners | Burn the gas to make heat | Uneven or yellow flames | $160 to $490 | n/a | Quoted after diagnosis |
| Combustion chamber | Holds the flame (oil furnaces especially) | Soot, poor burn | $110 to $650 | $200 to $600 (oil) | Quoted after diagnosis |
| Heat exchanger | Transfers heat while keeping exhaust out of the air | Cracks, soot, CO alarm | $110 to $1,620 | $100 to $200 repair; $500 to $1,500 replace | Quoted after diagnosis |
| Coils | Heat or cool air (on systems with a coil) | Weak heating or cooling, leaks | $650 to $2,160 | n/a | Quoted after diagnosis |
| Flue pipe | Carries exhaust out of the house | Corrosion, gaps, exhaust smell | $430 to $870 | n/a | Quoted after diagnosis |
| Furnace filter | Catches dust before it reaches the furnace | Weak airflow, short cycling | $1 to $38 | n/a | Replaced at tune-up |
Seattle and national figures are third-party estimates. Home Comfort Alliance prices as of September 2026.
Flame sensor
Seattle: $160 to $270; national: $150 to $250. A flame sensor that is only dirty can often be cleaned rather than replaced. The tell-tale sign is burners that light and then shut off after a few seconds. If your furnace won’t start at all, our guide to a furnace that won’t turn on and our post on furnace short cycling cover the other causes.
Ignitor
Our ignitor replacement is $353 to $821. Angi’s Seattle range is $160 to $540, and its national figure is $150 to $500. A furnace that clicks, tries to start and never lights is the classic sign.
Blower motor
Seattle: $160 to $2,160. Angi’s blower motor guide puts the average at $560, with standard PSC motors at $350 to $800, ECM motors at $600 to $1,150 and variable-speed motors at $600 to $1,500 (July 2026). ECM and variable-speed motors cost more because they have their own electronics and change speed to match demand. If the motor is still under its parts warranty, Angi notes you may pay only around $150 in labor.
Draft inducer motor, control board and gas valve
The inducer motor clears exhaust before the burners light ($220 to $1,620 in Seattle). The control board runs the start-up sequence ($220 to $650). The gas valve opens the gas to the burners ($220 to $650). All three show up as a furnace that won’t start or stops partway through.
Cracked heat exchanger
Angi puts heat exchanger repair at $100 to $200 and replacement at $500 to $1,500 nationally; its Seattle range is $110 to $1,620. A cracked heat exchanger can let exhaust and carbon monoxide into your air, so it isn’t a repair to put off. On an older furnace, it is usually the point to price a replacement too.
What drives the price
- The part: sensors and ignitors are cheap; motors and heat exchangers are not.
- Your furnace’s make, model and fuel: some parts are brand-specific or harder to find.
- Access: an attic or crawlspace furnace takes longer than one in a garage or closet.
- Diagnosis: a deeper diagnostic takes more time than a standard one.
- Time of the call: after-hours visits carry an extra fee.
- Warranty: a part still under warranty can cut the bill to labor only.
- Labor: Angi puts labor at $50 to $150 an hour, with $100 to $200 minimums for small jobs, and 40% to 90% of the total bill; in Seattle that is about $140 to $310 on average.
After-hours and emergency furnace repair cost
Our phones are answered and bookings are accepted 24/7. Heating technicians work during business hours and are available after hours for qualifying emergencies, such as no heat in cold weather, in every city we serve. The after-hours fee is $330, listed on its own and stated before we come. Our current offer is $50 off emergency no-heat calls; it cannot be combined with other offers and is not valid for the trip charge or diagnostic fee. See emergency furnace repair for what to check first.
Gas, electric and oil furnace repairs
| Furnace type | Common repair parts | Notes |
|---|---|---|
| Gas | Ignitor, flame sensor, inducer motor, pressure switch, gas valve, heat exchanger | Most of the parts in the table above |
| Electric | Heating elements, sequencers, limit switches, blower motor | No burners or combustion parts, so fewer parts to fail |
| Oil | Nozzle, oil filter, pump, ignition transformer, combustion chamber | Angi puts oil combustion chamber work at $200 to $600; our oil furnace tune-up is $336 ($288 for Club members) |
More on the differences: gas furnace vs electric furnace. Thinking of leaving oil? See oil to heat pump conversion.
Is it worth repairing a 15-year-old furnace?
Often yes for a small repair, often no for a big one. ENERGY STAR suggests considering replacement once a furnace is more than 15 years old, especially if it needs frequent repairs and your energy bills are going up. Angi puts gas and oil furnace life at 15 to 25 years and electric furnaces at 20 to 30 years (updated September 2026).
The $5,000 rule, worked out
Multiply the furnace’s age by the repair cost. If the answer is over $5,000, get a replacement quote too. Example: a 15-year-old furnace needing a $353 ignitor (the low end of our price) gives 15 × $353 = $5,295. The rule says look at replacement, yet a $353 ignitor on a safe furnace is usually still worth doing. Treat the rule as a starting point, not a verdict.
The 50% rule
HomeAdvisor suggests comparing new models once a repair passes half the cost of a new furnace. For a replacement price, get a range in about 30 seconds with our free instant quote tool; our furnace cost guide covers what goes into it.
When replacement usually wins
- A cracked heat exchanger
- Repeated repairs in a season or two
- Rising bills on an older furnace
- Parts that are no longer made
- You were planning a heat pump anyway: see gas to heat pump conversion
If your furnace is safe and the fix is a small part, repairing it is usually the cheaper choice, and we’ll tell you so. For the full decision, read furnace repair vs replacement and how long HVAC systems last.
Ways to lower your furnace repair bill
- A yearly tune-up: $230, or $180 for Home Comfort Club members. See furnace tune-up cost in Seattle and HVAC maintenance.
- Clean filters: a clogged filter strains the blower and can trip the high-limit switch.
- The Home Comfort Club: $15 a month for HVAC, or $30 for all three trades, with annual maintenance, member pricing on repairs and priority scheduling. Club members with a new system installed by Home Comfort Alliance get extended labor coverage for up to 5 years from installation. See the Home Comfort Club.
- An upfront price: approve the repair only after you see it.
- Current offers: see special offers. Offers can’t be combined with Club pricing.
- Financing: payment plans from $179/month* through Salal Credit Union or Synchrony. See financing.
*Financing through Salal Credit Union or Synchrony, subject to credit approval. Rates, terms and monthly payments depend on the amount financed, the plan and your credit. 0% interest options are available to qualifying customers. See lender for full terms.
Repairs generally aren’t covered by utility rebates, and the federal 25C credit ended for equipment placed in service after December 31, 2025. See rebates for replacement incentives.
Furnace repair cost FAQ
How much does furnace repair cost in Seattle?
Most Seattle-area furnace repairs cost $139 to $544, and the average is $341 (regional estimate, Angi Seattle, updated August 2026). At Home Comfort Alliance, the dispatch fee is $119 and a standard diagnostic is $72, listed separately. You approve an upfront repair price before any work begins.
What is the most expensive furnace repair?
A blower motor, a draft inducer motor or a cracked heat exchanger usually costs the most. Angi’s Seattle data shows blower motors up to $2,160 and heat exchangers and inducer motors up to $1,620 (August 2026). On an older furnace, a cracked heat exchanger is usually the point to compare replacement.
How much does it cost to replace a flame sensor?
Angi puts flame sensor replacement at $160 to $270 in Seattle (August 2026) and $150 to $250 nationally. A dirty sensor can often be cleaned instead, and our technician will tell you which it needs before any work begins.
How much does a furnace ignitor replacement cost?
Home Comfort Alliance charges $353 to $821 for ignitor replacement (prices as of September 2026). Angi’s Seattle estimate is $160 to $540 (August 2026). Our dispatch and diagnostic fees are listed separately.
How much does a furnace blower motor cost to replace?
Angi reports an average of $560, with standard PSC motors at $350 to $800 and ECM motors at $600 to $1,150 (July 2026). Seattle jobs range from $160 to $2,160 (Angi, August 2026).
Is there a fee to diagnose my furnace?
Yes. Our dispatch (trip) fee is $119, a standard diagnostic is $72, and a deeper diagnostic is $130 (September 2026). Each fee is listed on its own, and you see the repair price before we start.
Do you charge more for after-hours furnace repair?
Yes. Our after-hours fee is $330, and we tell you before we come. Our heating technicians are available after hours for qualifying emergencies, such as no heat in cold weather, in every city we serve. Our current offer is $50 off emergency no-heat calls (not valid for trip or diagnostic fees).
Is it worth repairing a 15-year-old furnace?
It depends on the repair. ENERGY STAR suggests considering replacement once a furnace is more than 15 years old, and Angi puts gas furnace life at 15 to 25 years. A small, safe repair is usually still worth it; a large repair or a cracked heat exchanger usually isn’t.
What is the $5,000 rule for furnaces?
Multiply the furnace’s age by the repair cost. If the result is over $5,000, get a replacement quote too. It’s a rule of thumb: a small repair on a safe furnace can still make sense when the math says otherwise.
How long does a furnace last?
Angi puts gas and oil furnaces at 15 to 25 years and electric furnaces at 20 to 30 years (September 2026). Yearly maintenance and clean filters help a furnace reach the upper end.
Do rebates or tax credits help pay for furnace repairs?
Generally no. Utility rebates go to new equipment, and the federal 25C credit ended for equipment placed in service after December 31, 2025. If you replace a gas furnace, Cascade Natural Gas customers may qualify for furnace rebates; PSE offers rebates for switching to a heat pump rather than for a new gas furnace.
How can I lower my furnace repair costs?
Get a yearly tune-up ($230, or $180 for Home Comfort Club members), change filters, and approve repairs only after you see an upfront price. Club members get priority scheduling and member pricing on repairs, and financing is available from $179/month* (Salal Credit Union or Synchrony, subject to credit approval).
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Sources: Angi, furnace repair cost in Seattle (August 2026); Angi, furnace repair cost (September 2026); Angi, furnace blower motor replacement cost (July 2026); HomeAdvisor, furnace repair cost (June 2026); ENERGY STAR, when to replace heating and cooling equipment; Cascade Natural Gas, emergency information. Checked October 2026.