Furnace Repair in Houston, TX
Furnace repair in Houston, TX — igniters, flame sensors, inducer motors, heat exchanger safety checks. Licensed techs, honest prices. Call today.
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Quick answer: Houston furnaces fail quietly — they sit idle nine months a year, then get asked to work during a January cold snap. The most common repairs are igniters, flame sensors, inducer motors and blower issues, typically $150–$900. If you smell gas or your carbon monoxide detector alarms, leave the house and call 911 and CenterPoint first, then call +1 (254) 256-1678.
Signs your furnace needs repair
- The furnace starts, runs a few seconds, then shuts off — classic dirty flame sensor
- Blower runs but the air never warms up
- Clicking or booming at startup (delayed ignition)
- The furnace short-cycles every few minutes
- Unusual smells: dusty burning at first start is normal; gas, electrical or metallic smells are not
- The thermostat calls for heat but nothing happens
- Your CO detector has alarmed, even once
Gas and electric furnaces
Most Houston homes with central heat run a natural gas furnace paired with the AC coil in the attic or a closet; all-electric homes use an air handler with heat strips, often as part of a heat pump system. Gas furnaces fail at the igniter, flame sensor, inducer motor, gas valve and control board. Electric air handlers fail at the heat strips, sequencers and blower motor. Diagnosis follows the same logic either way: verify the thermostat call, trace the ignition sequence, and measure the failed component rather than guessing.
Safety comes first: carbon monoxide and heat exchangers
Every furnace service call includes a visual heat exchanger inspection and a combustion check. A cracked heat exchanger can push carbon monoxide into your ducts, and there is no safe way to keep running that furnace — the honest answer is shutdown and replacement of the exchanger or the furnace. If a technician ever tells you a crack "can wait," get a second opinion. Keep working CO detectors on every floor; they are the only early warning you get.
The Houston factor: short season, long idle
Houston's heating season is short — a handful of cold fronts and the occasional hard freeze. That is exactly why furnaces fail here: igniters and flame sensors corrode during nine months of humid idle time, and the first real cold snap in December or January triggers a wave of no-heat calls across Harris County. A quick fall startup check catches a weak igniter before the freeze does. The upside: because run hours are so low, Houston furnaces routinely last 18–25 years, so most repairs are genuinely worth making.
What furnace repair costs in Houston
| Repair | Typical Houston range | Note |
|---|---|---|
| Diagnostic / service call fee | $75–$200 | Often credited toward the repair |
| Blower motor replacement (PSC) | $300–$900 | |
| Control board replacement | $300–$900 | |
| Furnace igniter / flame sensor | $150–$450 | |
| Furnace inducer motor | $400–$1100 |
Ranges aggregated from HomeGuide, Angi and HomeAdvisor cost guides and Houston-area contractor pricing pages, collected October 2026.
Exact price only after diagnosis — call +1 (254) 256-1678. Full list on the Houston AC repair cost page.
Repair or replace?
Furnaces get a different version of the $5,000 rule because of their long Houston lifespan. A $300 igniter on a 15-year-old furnace is an easy repair decision. A cracked heat exchanger on the same furnace is not — the part and labor approach the cost of a new unit, and the rest of the furnace is already old. Control board and inducer failures sit in between: worth fixing under about 18 years of age, marginal beyond that.
Frequently asked questions
Why is my furnace blowing cold air?
The most common causes are a failed igniter, a dirty flame sensor that shuts the burners down seconds after ignition, or a tripped limit switch from a clogged filter. The blower still runs, so you feel room-temperature air. All three are same-visit repairs, typically $150–$450.
Is a cracked heat exchanger dangerous?
Yes. A cracked heat exchanger on a gas furnace can leak carbon monoxide into the airstream. Signs include a yellow or flickering burner flame, soot, and flu-like symptoms that ease when you leave home. A cracked exchanger means the furnace must be shut down until repaired or replaced — no exceptions.
I smell gas near my furnace. What do I do?
Do not touch switches or thermostats. Leave the house, call 911 and CenterPoint Energy's gas emergency line from outside, then call for furnace service once the gas company clears the home. A gas smell is never a wait-and-see problem.
How much does furnace repair cost in Houston?
Diagnosis runs $75–$200. Common repairs: igniter or flame sensor $150–$450, inducer motor $400–$1,100, control board $300–$900, blower motor $300–$900. Heat exchanger replacement is rarely economical — on an older furnace it usually means replacement of the unit.
Does it make sense to repair a furnace in Houston's mild winters?
Usually yes. Because Houston furnaces run only a few hundred hours per year, they last far longer than the cooling equipment — a 15- or 20-year-old furnace with a failed igniter is often worth a $250 repair. The exceptions are cracked heat exchangers and repeated control failures.
Should I get a carbon monoxide detector?
Yes — every Houston home with a gas furnace should have CO detectors on each floor, especially near bedrooms. They are inexpensive and are the only reliable way to catch a heat exchanger or venting failure before symptoms appear.
Need AC repair today?
Call now and we will connect you with a licensed Houston HVAC technician. Exact pricing is confirmed after on-site diagnosis — no surprises.