Furnace Blowing Cold Air

Cool air from the vents in a high-country winter means the burner side has quit while the fan carries on, and that gap is worth a call today.

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When this becomes an emergency

Registers are pushing room-temperature air while the thermostat calls for heat.
The fan runs steadily but nothing in the house gets warmer.
The burner lights briefly and drops out again a moment later.
The unit locks out and stays quiet until power is cycled.

What a pro does

Cool air from the registers points at the heat source, not the blower. A technician confirms whether ignition actually happens, inspects the ignitor and flame sensor for the fine grit that thin dry air carries into everything up here, and checks whether a safety lockout is holding the burner off while the fan keeps circulating. On propane equipment the same complaint can trace to gas pressure that drops off when the tank is cold and low, which produces an ignition that starts and then loses flame. Forcing a system past its lockout isn't ever the answer.

Frequently asked questions

Is a dirty flame sensor really enough to stop the heat?

Yes. The sensor proves flame to the control board, and a film on it reads as no flame at all, so the board shuts the gas within seconds of lighting.

Does propane behave differently than natural gas here?

It can. A cold, nearly empty tank delivers weaker vapor pressure, and a burner that lights and then starves is a classic version of that problem.

Will a clean filter fix cool air?

A choked filter more often shows up as weak airflow, though the overheating it causes can trip the same safety limit and produce this complaint indirectly.

Is it harmful to leave the thermostat calling for heat?

The fan alone hurts nothing, but letting a burner attempt and fail over and over through a long night puts needless wear on the ignition components.

Furnace Blowing Cold Air?

Get connected with a local pro now.

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Keep going

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