Furnace Blowing Cold Air

Cool air moving through a house during a long heating season means the burner side has quit while the fan carries on, so get it looked at before the place drops much further.

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When this becomes an emergency

Register air feels cool against your hand while the blower runs at full speed.
The set point never gets reached no matter how long the system runs.
You can hear ignition attempts that don't lead to any heat.
The fan runs continuously and the house keeps losing ground overnight.

What a pro does

Cool supply air is a burner story, not a fan story. The tech watches an ignition sequence end to end and reads what the board is reporting, because a flame sensor coated in a season of residue will shut the gas off a second after lighting and log it as no flame at all, which looks identical from the living room to a dead ignitor. Lockouts get respected, never bypassed. On oil equipment the same complaint often traces to a worn nozzle or a pump that's lost pressure, and on a system running eight months a year those wear items simply come due sooner than they would somewhere with a short winter. Age of the equipment shapes where the search starts.

Frequently asked questions

Why does the fan keep running if the burner has stopped?

Many control boards keep the blower going after a failed heat call so the cabinet doesn't hold heat. It feels like a malfunction, though it's the design working as intended.

Can a long heating season make this happen sooner?

It can. Ignitors and flame sensors wear by run hours, so equipment that fires from fall through late spring reaches the same wear point in fewer calendar years.

Is a filter change worth trying first?

It's a fair thing to rule out, since choked return air can trip a high-limit and produce the same cool-air complaint indirectly.

Should the thermostat be left calling for heat in the meantime?

Better to set it back. Repeated failed ignition attempts stack wear on the same components that are already the suspects.

Furnace Blowing Cold Air?

Get connected with a local pro now.

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Keep going

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