Furnace repair costs $300 on average in 2026, with most jobs landing between $130 and $600 depending on the part that failed and how long the technician is on-site. That number doesn't include the diagnostic fee most HVAC contractors charge separately, typically $75 to $200, before any repair work begins.
- Furnace repair cost averages $300 in 2026, ranging from $130 to $600 for most residential jobs.
- Diagnostic fees run $75 to $200 and are usually charged before any repair estimate is given.
- A blown blower motor runs $450 to $2,000; a cracked heat exchanger runs $1,500 to $3,500 and often makes replacement the smarter call.
- West Heating & Cooling offers 24/7 emergency furnace repair across Camdenton, Osage Beach, Lake Ozark, Warsaw and Lebanon, Missouri.
Why this matters
A furnace usually fails on the coldest night of the year, not on a Tuesday afternoon when you have time to shop around. Knowing the real cost range before the technician arrives keeps you from overpaying on an emergency call or agreeing to a full furnace replacement when a $200 part would have fixed it. If you're weighing repair against a full swap, the new furnace cost guide breaks down installed pricing for Missouri homes so you can compare the two numbers side by side.
How much does furnace repair cost in 2026?
The total depends entirely on which part failed. A sticking flame sensor is a different bill than a failed blower motor.
| Repair | Typical cost range (2026) |
|---|---|
| Diagnostic / service call | $75 \u2013 $200 |
| Igniter replacement | $150 \u2013 $300 |
| Thermostat repair or replacement | $150 \u2013 $300 |
| Circuit board replacement | $200 \u2013 $600 |
| Blower motor replacement | $450 \u2013 $2,000 |
| Heat exchanger replacement | $1,500 \u2013 $3,500 |
Most single-part repairs land in the $130 to $600 band. Anything above that usually means a major component failed, and that's the point where it's worth asking a technician whether repair or replacement makes more financial sense for a furnace that's already 12 to 15 years old.
Igniter replacement: $150 to $300
A failed igniter is one of the most common reasons a gas furnace won't fire, and it's a straightforward swap for most technicians. Verdict: Repair it \u2014 this is a low-cost fix that shouldn't push anyone toward replacing the whole unit.
Circuit board replacement: $200 to $600
The control board manages ignition timing, blower cycles and safety shutoffs. When it fails, the furnace often won't respond to the thermostat at all, or it short-cycles. Verdict: Repair it, unless the furnace is already past 15 years old and other parts are starting to go too.
Blower motor replacement: $450 to $2,000
The blower pushes heated air through the ductwork, and cost varies widely based on whether it's a standard single-speed motor or a variable-speed unit paired with an ECM module. Verdict: Repair it for most homes, but get the exact motor type confirmed before agreeing to the higher end of that range.
Heat exchanger replacement: $1,500 to $3,500
A cracked heat exchanger is a safety issue, not just a comfort issue, because it can leak combustion gases into the airflow. Parts and labor on this repair frequently rival the cost of a mid-tier furnace. Verdict: Compare against replacement before committing \u2014 on a furnace over 10 years old, a new unit is often the better use of the money.
Why furnace repair costs vary
- Age of the unit \u2014 furnaces past 12 to 15 years often need parts that are harder to source, which raises labor time and cost.
- Brand and parts availability \u2014 some furnace brands use proprietary boards or blowers that cost more to replace than universal parts.
- Time of service call \u2014 nights, weekends, and holiday emergency calls typically carry a premium over standard business-hours pricing.
- Whether it's under warranty \u2014 a furnace still inside its manufacturer parts warranty can cut the bill dramatically, sometimes down to labor only.
- Ductwork and system complexity \u2014 zoned systems or homes with add-on components like UV purifiers or dehumidifiers can add diagnostic time.
- Missed maintenance \u2014 a furnace that's never had a tune-up is more likely to need a full-blown repair instead of a minor adjustment. A maintenance plan that catches worn parts early tends to keep repair bills on the low end of the range.
Is it cheaper to repair or replace a furnace?
Repair is cheaper in the short term for almost any single-part failure under $600, which covers igniters, thermostats, and circuit boards. Replacement becomes the better financial move once repair costs climb past $1,500 on a furnace that's already 10-plus years old, since a second major repair is likely within a year or two.
How much does a furnace tune-up cost?
A furnace tune-up costs far less than an emergency repair call because it's scheduled labor, not diagnostic work under pressure. Skipping the annual tune-up is one of the fastest ways to end up paying the $450 to $2,000 blower motor bill instead of a routine cleaning charge.
Does homeowners insurance cover furnace repair?
Standard homeowners insurance does not cover furnace repair from normal wear and age \u2014 it typically only applies when the damage comes from a covered peril like fire or a burst pipe. A home warranty plan is a separate product that some homeowners carry specifically to offset mechanical breakdown costs like this.
For homeowners at the Lake of the Ozarks, West Heating & Cooling runs diagnostic and repair calls across Camdenton, Osage Beach, Lake Ozark, Warsaw and Lebanon, and the same technician who diagnoses the issue can quote repair versus replacement on the spot rather than sending a separate estimator out later.
Get a furnace repair quote today
24/7 emergency service across the Lake of the Ozarks area.
FAQ
How much does furnace repair cost in 2026?
Furnace repair costs $300 on average in 2026, with most jobs ranging from $130 to $600 depending on the part. Diagnostic fees of $75 to $200 are usually billed separately from the repair itself.
What is the most expensive furnace repair?
Heat exchanger replacement is the most expensive common furnace repair, running $1,500 to $3,500. At that cost, it's worth comparing against a full furnace replacement, especially on units over 10 years old.
Is furnace repair covered by warranty?
Furnace repair is covered by warranty only if the unit is still within its manufacturer parts coverage period, which typically runs 10 years on newer systems. Labor is often not included even when parts are covered.
How much does an emergency furnace repair cost at night?
Emergency furnace repair after hours or on weekends typically costs more than a standard daytime call because of overtime labor rates. The part cost stays the same; the labor premium is what changes.
Should I repair or replace a 15-year-old furnace?
A 15-year-old furnace is usually better replaced than repaired once a single repair estimate passes $1,000, since the unit is near the end of its typical service life. Compare the repair quote against installed replacement pricing before deciding.
How much does it cost to fix a furnace that won't turn on?
A furnace that won't turn on is most often an igniter, thermostat, or circuit board issue, costing $150 to $600 to fix. The diagnostic call, usually $75 to $200, determines which part failed before any repair pricing is confirmed.
Does a furnace tune-up prevent expensive repairs?
A furnace tune-up catches worn parts, like a weak igniter or dirty flame sensor, before they cause a full breakdown. Furnaces on a regular maintenance schedule tend to need fewer of the $450-plus repairs like blower motor replacement.
One last thing
The diagnostic fee is the detail most homeowners get surprised by \u2014 not the repair itself. Many contractors waive it when you approve the repair on the spot, but if you decline the work or want a second opinion, that $75 to $200 charge stands on its own. Ask about the fee structure before the technician even leaves the driveway, not after the invoice shows up.
