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Wednesday, September 04, 2013

With the winter months fast approaching, the time to start using your furnace regularly is right around the corner. An efficient furnace is one of the most important components of your Chicagoland home, ensuring warm air is dispersed throughout the house. However, a furnace blowing cold air is a cause for concern.

Prevention is the optimal goal when it comes to avoiding furnace issues. Taking the time for preventive maintenance each year will keep your furnace in good working order and identify and treat issues before they arise. This will ensure the issues below are highly unlikely to occur in the first place, while also giving you peace of mind that there are no safety concerns.

Potential Causes of a Furnace Blowing Cold Air

  • Furnace is warming up: Furnaces, like your bathroom tap, take a few seconds to warm up. When you initially turn your furnace on, it will take a couple of seconds for the heat to get through the vents, so you may feel cool air in the first few minutes.
  • The flame sensor is dirty: If your furnace is blowing warm air for a short while and then suddenly starts to blow cold air, there's a good chance the flame sensor's dirty, therefore your furnace's burner isn't remaining on. An experienced HVAC technician can handle this issue and get your furnace operating effectively again. 
  • Your pilot light is out: If you find your furnace blowing cold air at some point, this could be the issue. The pilot light or little blue flame is the ignition for the burner. If this goes out, the burner doesn't heat and warm air isn't produced. Relight the pilot light to get that warm air blowing again. If this is a constant issue, seek expert advice.
  • Fan setting is on: If you find your furnace blowing cold air from the get go, it may be a simple thermostat issue. To solve, ensure your fan is to "Auto."

For more information about how to handle a furnace blowing cold air, or any other home comfort concerns, contact We proudly serve homeowners throughout Chicago, as well as parts of northwest Indiana and southwest Michigan.

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