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Why is My Furnace Blowing Cold Air?

So you’ve turned on the heat yet the opposite effect happens—you feel cold air coming through your vents! Although it’s a common occurrence, it’s something that no one wants to experience.

We’ll explain some likely causes of why your furnace is blowing cold air and what you can do about it.


Causes of Cold Air Coming From the Furnace

There are many reasons why your furnace is blowing cold air. Here are a few explanations:

  • Check your fan settings. Look at your thermostat and make sure your settings are correct. Make sure your fan is set to AUTO instead of ON. When your fan is in the ON position, it runs continuously. That might be why it feels cold.
  • Your filter is dirty. A dirty air filter causes the furnace to work overtime which can cause it to overheat. This can trip the high limit switch which is a safety feature that shuts off the heating element. Change your furnace filter regularly.
  • The pilot light may be out. This is typically found in older furnaces. If the pilot light is out, there is no heat. Be sure to turn your furnace completely off before you reset the pilot light.
  • Low or no fuel. Whether the gas line was shut off or the gas is not supplying an adequate amount to the furnace, without fuel, you won’t have heat.
  • Ductwork problems. Major ductwork issues could be causing the air in your home to feel cold. If there’s a gap or large tear in your ductwork system, cold air will infiltrate your ducts.
  • Faulty furnace. As with any appliance in your home, your furnace won’t last forever. Especially if your unit is older than 15-20 years, it might be time to replace it.

While there are a few ways in which you can remedy the situation yourself, most chances are that you’ll need to call in an experienced heating technician.


Heating Repairs in Pittsburgh

Experiencing cold air in your Pittsburgh home? It’s time to call in help! Whether you have a gas furnace, an oil furnace, or a heat pump, One Hour Heating & Air Conditioning is here for all of your heating needs. Contact the experts at One Hour for professional HVAC services. We’re available 24/7 to restore comfort back in your home.

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