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Why Would My Furnace Be Blowing Cold Air?

If your furnace is blowing cold air, it could be something minor or major that is causing it. There are some things you can check before calling an HVAC company to repair your furnace.

Dirty Air Filter

The furnace air filter may be clogged, which can cause cold air to blow. A clogged air filter can cause the furnace to overheat and shut down. When this happens, the fan will continue to blow cold air into your home. Inspect the air filter and replace it if it appears dirty.

Thermostat Problem

Check the thermostat to see that it’s set up properly. If it’s set to below room temperature, the furnace will blow lukewarm air when it comes on. Also, check that the fan is set to “auto” and not “on” as otherwise, it will blow continuously regardless of whether the furnace is on or not.

Broken Flame Sensor

If the flame sensor in your furnace malfunctions, the furnace will shut down, and cold air will come out of your registers. It could be covered in dust, out of position, or is broken and needs to be replaced.

My Guys Plumbing, Heating & Air Conditioning in Conroe, TX, offers a furnace repair service. We’ve been in business since 2014 and have NATE-certified technicians.

Leaky Ducts

Leaky ducts can produce cold air coming from vents. Warm air produced by your furnace is lost to unconditioned spaces through holes and gaps in your ductwork. Seal any leaky areas that you see in exposed ductwork. Ducts in hidden areas can be sealed by a professional.

Clogged Condensate Line

High-efficiency furnaces have a condensate line that drains moisture. If the line becomes clogged, the burners won’t light. You can try to remove the clog by hand or use a drain snake to clear it.

At My Guys Plumbing, Heating & Air Conditioning, we repair, install and tune-up heaters and air conditioners. You can also rely on us for indoor air quality products and services. Please call today to schedule an appointment or if you have any questions.