From the hallway, a furnace that will not heat looks the same no matter what broke. Inside the cabinet, though, the sequence is strict: inducer on, pressure switch closed, igniter glowing, gas valve open, burners lit, flame proven, and finally the blower moving heat through the ducts. Diagnosis is mostly a matter of finding where that chain breaks. In San Angelo homes, it tends to be the same handful of culprits: a flame sensor coated in oxide, a hot surface igniter cracked by thermal cycling, a pressure switch held open by a tired inducer or a plugged condensate trap, or a control board with a burned relay.
Our experienced technicians diagnose a furnace the way it operates, in order, measuring each stage as it happens. That means igniter resistance, microamp flame signal, pressure switch operation under actual inducer draft, gas valve voltage, and blower and capacitor condition. Safety checks are never optional on a gas appliance: heat exchanger inspection, leak testing on the gas connections, and flue draft verification, since a hazard rarely shows itself at the thermostat. We finish by checking temperature rise against the data plate, making sure the burner and blower are matched the way the manufacturer designed them to.
We work on natural gas, propane, and electric furnaces from every major brand, both conventional 80 percent units and condensing high-efficiency models with their traps, drains, and dual pressure switches. The truck stock covers the parts that actually fail: igniters, flame sensors, pressure switches, capacitors, inducer assemblies, and blower motors, so most no-heat calls end with heat the same visit. For furnace repair anywhere in San Angelo, call (325) 204-0750 and an experienced technician will be headed your way today.
When the AC quits in summer, see AC Repair in San Angelo.
How Much Does Furnace Repair Cost in San Angelo?
Most furnace repairs in San Angelo cost between $150 and $600. Ignition and sensor problems are usually the least expensive, while blower motors, control boards, and heat exchangers cost more. Every furnace repair starts with a real diagnosis and a clear price.
| Repair | Typical cost | What it usually means |
|---|---|---|
| Flame sensor cleaning or replacementFurnace lights, then shuts off within seconds | $80–$250 | Furnace lights, then shuts off within seconds |
| Hot surface igniter replacementFurnace clicks and tries to start but never lights | $150–$400 | Furnace clicks and tries to start but never lights |
| Draft inducer motorStartup fan fails, furnace won't fire | $400–$1,000 | Loud humming or grinding at startup, then lockout |
| Blower motorNo airflow, or the blower runs nonstop | $400–$1,500 | Burners run but little or no air comes out of the vents |
| Control boardErratic behavior, error codes, or no response at all | $300–$700 | Furnace won't respond to the thermostat |
| Gas valve replacementValve fails to open, so the furnace never lights | $250–$700 | Igniter glows but gas never flows to the burners |
Typical ranges for common repairs. Your exact price is quoted after diagnosis.
What Moves the Cost Up or Down
- The age and efficiency of the furnace, since high-efficiency models use more specialized parts
- A cracked heat exchanger, which is a safety issue and usually points to replacement
- Same-day or after-hours service versus a planned visit
- How easy the furnace is to reach
If your furnace is past 15 to 20 years old or the repair is a major one, we'll give you repair and replacement prices side by side. Call (325) 204-0750 to get your price.
Signs You Need Furnace Repair in San Angelo
Recognizing the warning signs early can save you time, money, and prevent significant damage to your property. Watch for these telltale signs that professional help is needed:
- Squealing or grinding from the blower compartment
- Rust streaks, soot, or water around the cabinet or flue
- The igniter glows and clicks, yet no flame ever appears
- Flames that start, last a few seconds, and go out again and again
- Booming or banging at light-off from delayed ignition
- Yellow, wavering burner flames where they should be sharp blue
- Short cycling every few minutes without reaching the setpoint
- The blower runs constantly but the air never warms
Don't Wait for a Total Failure
Left unchecked, even a small fault or temperature swing often signals a system working its way toward a breakdown. Don't wait, get San Angelo HVAC on the phone at (325) 204-0750 and we'll take a look right away.
Furnace Repair Issues? We Can Help.
Call our expert team for pricing today.
Call (325) 204-0750 TodayFrequently Asked Questions About Furnace Repair
Why Professional Furnace Repair Matters
A furnace combines gas, flame, high voltage, and a flue in one cabinet, and the failure that matters most is the one you cannot see from outside: a compromised heat exchanger passing combustion gases into the air your blower pushes through the house. Delayed ignition that booms at light-off stresses that exchanger further every morning it goes unfixed. Meanwhile the diagnostic traps stack up: a furnace that trips its high limit may have a bad switch, or it may be protecting itself from a clogged filter or a dying blower, and replacing the switch in the second case just removes a safety while leaving the fault.
At San Angelo HVAC, no symptom gets treated in isolation. A meter tells us the flame signal, so we never condemn a good sensor while the real culprit, a cracked igniter or a weak gas valve, keeps causing trouble. We confirm draft at both the pressure switch and the flue, measure temperature rise against the data plate to catch airflow problems early, and test the gas side with a leak detector, not a guess. When we are done, the furnace has proven itself safe and correct through a full cycle, and if it is nearing the end of its useful life, you will get an honest assessment.
What to Expect From Our Furnace Repair
Every visit follows a step-by-step method refined over years of hands-on experience. Here's exactly how the furnace repair process unfolds:
Sequence Diagnosis
The furnace is run through its startup while we measure inducer draft, pressure switch response, igniter resistance, flame signal, and gas valve operation. The goal is to pinpoint the exact step that fails.
Safety Verification
On every visit, we inspect the heat exchanger, leak-test the gas connections, and confirm the flue is drafting. A repair is not complete until the unit is proven safe.
Targeted Repair
We fix the confirmed fault, and since igniters, flame sensors, pressure switches, capacitors, and motors are on the truck, most furnaces are heating again the same visit.
Full Verification
The last step is a full-cycle test: temperature rise matched to the data plate, smooth ignition with no booming, and every limit switch and safety control confirmed working.
Want a Professional Opinion?
Call San Angelo HVAC to discuss your furnace repair needs with an experienced technician.
Call (325) 204-0750 NowFurnace Repair Prevention Tips
A little routine maintenance goes a long way toward avoiding a mid-season breakdown. Put these technician-approved steps to work around your property:
- If you have a high-efficiency furnace, check that the condensate drain is flowing freely
- Store laundry supplies, especially chlorine products, well away from the furnace closet
- Test your CO detectors monthly and make sure each floor has one
- Put in a fresh filter monthly through the heating season, the cheapest protection your furnace can get
- Pay attention when the burners light, since a boom instead of a soft whoosh calls for service
- Avoid packing the utility room, because burners need open space for combustion air
- Schedule service each fall to catch worn igniters and dirty sensors before cold weather arrives
DIY vs. Professional Furnace Repair
Online tutorials may help in a pinch, yet lasting repairs and code-compliant installations usually depend on professional methods and trained technicians. Here's a comparison:
| Factor | DIY Attempt | Professional Service |
|---|---|---|
| Exchanger Cracks | Damage hidden inside the cabinet | Checked every time we open the unit |
| Ignition Faults | Guesswork based on blink codes | Each ignition component tested |
| Gas Connections | A loose union goes unnoticed | Instrument leak test on each visit |
| Limit Trips | Limit replaced, cause left behind | Filter, blower, and ducts checked for the cause |
| Airflow Match | Airflow assumed, not measured | Blower tuned to the rated rise |
| Final Check | One good start and done | Full cycles proven clean and safe |
Get Furnace Repair Help Today
Get your comfort back before a small fault becomes a full breakdown. San Angelo HVAC is ready to respond fast.
Call (325) 204-0750 NowAreas We Serve for Furnace Repair
We bring furnace repair to homes and businesses in town and across the nearby communities. Pick your area to see local details.