Furnace & Heating Repair in Dallas
Furnace repair in Dallas: igniters, flame sensors, heat exchanger safety, blower motors. CO safety checks, honest repair-vs-replace math. Calls answered 7am–9pm daily.
Calls answered 7:00 AM – 9:00 PM CT, 7 days a week
Quick answer: Dallas furnaces fail in a predictable pattern — they sit idle from March to November, then everything weak shows up in the first cold snap. Most repairs are fast and inexpensive ($150–$450 for the common igniter and flame sensor jobs). The one exception is a cracked heat exchanger, which is a carbon-monoxide safety issue, not a comfort issue. Call +1 (254) 256-1680 — calls answered 7:00 AM – 9:00 PM CT, 7 days a week.
Why furnaces break differently in Dallas
A Dallas gas furnace lives a strange life: it runs hard for a few weeks a year and sits in a 130–150°F attic the rest of the time. That cycle creates its own failure pattern. Igniters and flame sensors corrode during the long idle months and fail on the season's first start. Heat exchangers expand and contract through extreme attic temperature swings. And when a real cold snap hits North Texas — the kind that drops DFW into the teens — every weak furnace in the metroplex fails the same week, which is exactly when you do not want to be waiting on a part.
The February 2021 freeze showed what extended hard cold does to DFW homes and their heating systems. Winterization and a fall tune-up are cheap insurance; a no-heat call during a freeze with every contractor in the metroplex booked out is not a position you want to be in.
Common furnace repairs we handle
- Flame sensor cleaning/replacement — furnace lights, then shuts off after seconds. The single most common heating call in Dallas, and one of the cheapest to fix.
- Hot-surface igniter replacement — no flame at all; the igniter glows weakly or not at all. Fast, same-visit repair.
- Limit switch and rollout switch — furnace overheats and locks out, usually from a clogged filter or blocked vents starving airflow.
- Inducer motor — the small motor that vents combustion gases; failure means no heat and sometimes a burnt-plastic smell.
- Blower motor — weak airflow on both heating and cooling. See blower motor repair.
- Control board — erratic behavior, error codes, dead furnace with power present. Common after power surges.
- Heat exchanger inspection — visual and camera inspection for cracks, with a straight answer on repair vs replace.
Carbon monoxide: the part that is not optional
Gas heat is safe when the heat exchanger is intact and combustion is venting properly. A cracked exchanger breaks that separation and can push carbon monoxide into the airstream — odorless, and dangerous at levels you will not feel until you are sick. Every furnace repair visit through AC Repair Dallas includes a visual heat exchanger check, and we will tell you plainly what we see.
If a CO detector alarms while the heat runs: get everyone out, leave doors open behind you, and call 911 or the gas utility from outside. Do not re-enter until cleared. Then call us — a CO event from a furnace almost always ends in heat exchanger replacement or a new furnace.
Every Dallas home with gas heat should have working CO detectors on each floor and near bedrooms. They are cheap; treat them like smoke alarms.
What the visit looks like
- Symptom and error codes. The board's blink code or stored faults usually point straight at the failing circuit.
- Ignition sequence test. Watch a full start: inducer, pressure switch, igniter, gas valve, flame proof, blower. Where the sequence stops is where the failure is.
- Safety checks. Heat exchanger visual, gas line connections, venting, rollout and limit switch operation.
- Written price, then repair. Flat price approved before work; most common parts are on the truck.
What furnace repair costs in Dallas
| Repair | Typical Dallas range | Note |
|---|---|---|
| Diagnostic / service call fee | $75–$200 | Often credited toward the repair |
| Thermostat replacement | $120–$450 | Smart thermostats higher |
| 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, HomeAdvisor and Forbes Home cost guides plus Dallas–Fort Worth contractor pricing pages, collected October 2026.
Exact price only after diagnosis — call +1 (254) 256-1680. Full list on the Dallas AC repair cost page.
Frequently asked questions
What are the most common furnace problems?
In Dallas the list is short and seasonal: dirty flame sensors (the furnace lights, then shuts off after a few seconds), failed hot-surface igniters (no flame at all), tripped limit switches from restricted airflow, inducer motor failures, and — the serious one — cracked heat exchangers. Because DFW furnaces sit idle for eight-plus months, the first cold snap of the year is when all of these surface at once.
Why does my furnace turn on, then shut off after a minute?
Nine times out of ten that is a dirty flame sensor. The burner lights, the sensor cannot prove flame through the carbon film on it, and the control board shuts the gas valve for safety. It is a cheap, fast repair. Less commonly it is a tripped limit switch from a filthy filter or closed vents — change the filter before you call and you may fix it free.
Is a cracked heat exchanger really that serious?
Yes. The heat exchanger separates combustion gases from your breathing air; a crack can leak carbon monoxide into the airstream. A confirmed crack means the furnace is red-tagged — legally and ethically it cannot run until repaired or replaced, and on a 15+ year old furnace replacement is almost always the right call. If your CO detector alarms when the heat runs, get out, air the house, and call.
How much does furnace repair cost in Dallas?
Most furnace repairs in Dallas run $150–$900. A flame sensor cleaning or igniter typically lands at $150–$450, an inducer motor $400–$1,100, a blower motor $300–$900, and a control board $300–$900. A heat exchanger replacement rarely makes sense on older furnaces — that is replacement territory. Full table: Dallas HVAC price guide.
Should I repair or replace my furnace?
Apply the $5,000 rule: furnace age × repair cost; over $5,000, price a replacement. A 16-year-old furnace with a $900 inducer motor scores 14,400 — replace it. Dallas-specific wrinkle: because heating hours here are a fraction of northern climates, a well-maintained furnace often lasts 18–20 years, so repair stays viable longer than up north — as long as the heat exchanger is sound.
Why does my house smell like gas when the furnace starts?
A brief dusty smell at the season's first startup is normal — dust burning off the heat exchanger. A persistent rotten-egg (mercaptan) smell is not: that is the gas odorant, and it means a possible leak. Leave the house, do not flip switches, call the gas utility's emergency line from outside first, then us about the furnace.
Need AC repair today?
Call now and we will connect you with a licensed Dallas HVAC technician. Exact pricing is confirmed after on-site diagnosis — no surprises.