Why Is My Furnace Blowing Cold Air?

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Why Is My Furnace Blowing Cold Air?

Waking up in a very cold house is not the best way to start your day. If your furnace is blowing cold air, there are a few things that you can check yourself before calling us.


Make sure your thermostat fan is set to “auto.” Set to “on,” the fan will blow continuously, circulating air through your house regardless of whether your furnace is heating the air or not.blowing cold air bundled man

Air Filter

Check the air filter to determine if that is the issue. A dirty air filter restricts airflow over the furnace’s heat exchanger. This will cause overheating and will trigger a built-in safety switch which protects the unit from damage.

Pilot Light

Older furnaces have a standing pilot light. Assuming that you are familiar with your furnace, check the pilot light.

  • If it is ON: Turn it off and wait 3-5 minutes before turning it back on
  • If it is OFF: Try relighting it

Condensate Line

High-efficiency furnaces have a condensate line that could become clogged. Dust, dirt and mold can clog the line and trigger the overflow kill switch which protects the unit from water damage.

Still Blowing Cold Air?

If you have checked all of the above and your furnace is still blowing cold air, you may need professional assistance. Don’t hesitate to schedule an appointment with us here at 1-800-anytyme. We would be happy to help you out! Contact us via our contact form or call (760) 477-0072 to speak with a member of our team today!

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