Kyle TX AC (888) 217-3739

An independent phone line that connects homeowners in Kyle, TX and nearby Hays County towns with heating and cooling contractors.

Kyle, TX · Hays County

The furnace will not light on the first cold night

A gas furnace in a Kyle attic sits idle through months of summer heat, then gets asked to work on the first cold front of the season. When it fails that night, the cause is usually one part in the ignition sequence: the ignitor, the flame sensor, the pressure switch or the inducer.

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Read what the furnace is doing

Nothing happens at all. Check that the thermostat is set to heat, that its batteries are good, and that the furnace switch near the unit (it looks like a light switch) is on.

The inducer motor runs, then it stops and starts over. Often the pressure switch or a blocked vent or condensate line on a high-efficiency furnace.

It clicks, glows, but no flame. Often the ignitor or the gas valve.

It lights, runs a few seconds, then shuts down. Classic flame sensor symptom: the burner lights, the furnace cannot confirm the flame, and it shuts the gas off for safety.

Many furnaces also blink a code on a small light visible through the panel window. Write down the pattern; it tells the technician where to start.

Why this happens to so many on the same night

The San Marcos station averages about 20 nights a year at or below 32°F and a January average low near 39°F (NOAA 1991–2020 normals). Gas heats about 48% of Kyle households (Census ACS 2020–2024), and many of those furnaces went into attics during the 2000s building wave. They age together and are tested by the same cold front.

What to have ready when you call

  • What the furnace does, using the descriptions above, and any blinking code
  • Whether there is any heat in the house, and the indoor reading
  • The install year from the label in the attic unit
  • Your address, ZIP code and attic access

Common questions

I smell gas. Leave the house and call 911 or the gas utility from outside first.

Can I clean the flame sensor myself? Some owners do. A furnace that needs it every season has another cause, and gas appliance work is licensed in Texas through TDLR.

Have the install year and the thermostat reading ready. Ask who is taking calls in your ZIP code today.

(888) 217-3739

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Other things a system does

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A ceiling stain or water dripping under the attic AC unitA ceiling stain or dripping water under the attic air handler in Kyle, TX usually means a clogged condensate drain or a full drain pan. What to do and what to ask.
Ice on the copper line or the attic unit in JulyFrost on the copper line or ice in the attic unit in a Kyle, TX summer means airflow or refrigerant trouble. What to do now and what a technician checks.
The AC runs all afternoon and the house keeps getting warmerThe AC runs nonstop and the house climbs past the setting every afternoon in Kyle, TX. What separates a weak system from a failing one, and what to report.
The heat pump is stuck on aux or emergency heatHeat pump showing aux heat all the time in Kyle, TX, or stuck on emergency heat? What is normal on a cold night, what is a fault, and what to report.
The house still has the system the builder installedStill running the AC and furnace the builder installed in a 2000s Kyle, TX house? How to find its age and refrigerant, and when replacing it makes sense.
The outdoor heat pump is covered in iceOutdoor heat pump iced over in a Kyle, TX cold snap? Light frost is normal; a solid block is not. What defrost does, what fails, and what to do now.
The outdoor unit hums, but the fan does not spinThe outdoor AC unit hums but the fan won't start in Kyle, TX heat. Usually a capacitor; sometimes the compressor. What to do and when it means replacement.
The upstairs or one back room never cools downOne room or the whole upstairs stays hot while the rest of a Kyle, TX house cools. Attic ducts, returns and sizing: what a technician measures.

Towns this line covers

Kyle 78640Buda 78610Uhland 78640Niederwald 78640Mountain City 78610San Marcos 78666Driftwood 78619Dripping Springs 78620

Updated

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