Furnace Blowing Cold

3 Reasons Your Furnace is Blowing Cold Air

November 13, 2022

Have you noticed your furnace is blowing cold air? Before you panic, know this: a knowledgeable HVAC service technician can usually repair this problem quickly. Here are some possible reasons a furnace in Gettysburg, MD, can blow cold air:

Air Filter is Dirty

Your service technician will first check the unit’s filter. Clogged filters can cause restricted airflow and result in an overheated furnace. The furnace’s limit switch turns off the unit’s burners to prevent overheating.

Limit switches are safety control devices, and their primary job is protecting the furnace from potential damage. So, although the hot air from your vents is alarming, your furnace is operating as expected when airflow is restricted. Once the service technician replaces the filter, warm air should resume blowing from the vents.

Ignition System is Malfunctioning

Gas furnaces have trouble producing hot air when there’s an issue with the unit’s ignition system. Gas-powered units must light the fuel; otherwise, the air coming from the furnace doesn’t heat sufficiently. Service technicians troubleshoot this problem by checking the furnace’s pilot light to see if it’s lit.

If it’s out, they’ll relight it and see if it stays on to heat the fuel. In cases when the pilot light keeps going out, our service technicians will check the gas valve to ensure it’s turned on. If it is and the problem persists, they will likely need to repair or replace the unit’s thermocouple.

Ductwork is Leaky

Leaky ductwork is another common problem that results in furnaces blowing cold air. Heated air easily escapes through damaged ductwork. Fortunately, resolving this problem doesn’t take long when you hire qualified service technicians to make repairs.

You don’t have to go through the winter with a furnace that doesn’t heat your home well. Our team at Cumberland Valley Heating & Air Conditioning is the best at troubleshooting all furnace problems. Call us today to schedule a heating repair and stay comfy in your home this winter.

Image provided by iStock

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