4 Reasons Your Furnace is Blowing Cold Air

October 20, 2020

When the winter months finally arrive and it is time to turn your furnace on, the last thing you and your family need is the feel of cold air coming through your vents. There is nothing quite like the frustration of dealing with a furnace that malfunctions when its services are most needed. The good news is the fix may be relatively simple once you discover what it is.

1. Furnace Not Yet Warm

A furnace that has been inactive for months will likely send a burst of cold air through the vents in your home when it’s first turned on. It is the equivalent of turning on the hot water faucet and feeling cold water run from the tap for the first few seconds. This problem will resolve itself if you allow the system to run for a few minutes.

2. Bad Pilot Light

You may want to check your pilot light if you are the owner of an older furnace that is blowing cold air. The owner’s manual for your furnace will provide instructions for relighting the pilot, and you can perform this step yourself if you feel comfortable with the process. You can call an HVAC technician to complete the job also. If your pilot light does not remain lit after being relit, it is a sign of a bigger problem with the system.

3. Clogged Air Filters

Unclean air filters will restrict the flow of air through your furnace and cause the entire system to work harder than usual. The added workload may result in your system overheating. A furnace that runs too hot will then push only cold air through the vents.

4. Flame Sensor Is Dirty

Furnaces that do not use a pilot to achieve ignition will use flame sensors to maintain a flame. A flame sensor covered in dust, dirt or other debris will power on, blow hot air through vents for a while and then begin to blow cold air only.

DuPree Heating & Air Conditioning has provided high-quality furnace repair services to Joliet residents for nearly three decades. If your furnace isn’t working properly, we can help. We are also available to handle any heating, air conditioning sheet metal and indoor air quality needs you may possess. For more information, please give us a call.

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