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Why the Furnace is Blowing Cold Air

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Keeping the furnace operating efficiently is important to the warmth and comfort of your home. If you notice an issue with your HVAC system, it is important to schedule an inspection as soon as possible.

Check The Thermostat

Is your furnace blowing cold air and you are noticing the fan is always on? Checking the thermostat is where one can diagnose the problem. If your thermostat’s fan setting is set to ON, then your furnace blower will constantly be operating ever when it is not putting warm air into your home. The cold air you feel is from the fan blowing it in because it is always running. To fix this issue is simple, just flip the fan switch from on to auto. Auto setting will tell the furnace only to blow warm into your home when the furnace is on.

Furnace Overheating

Furnace overheating can be the cause of your cold air dilemma. Changing the dirty air filter can solve this problem. The dirty air filter blocks the airflow, causing the furnace to run longer to heat your home until it overheats. It is important to note that constant overheating can damage your heat exchanger. When the problem reaches the heat exchanger, then it is time for a replacement. Do not wait for this to happen, replacements are more expensive than repairs.

Pilot Light goes Out

If this happens, relight the pilot light if you notice it is out. The instructions on how to do this are usually located on the furnace itself. If not, try to find the manual that came with the furnace. Also check to see if the furnace’s gas valve switch is on and clean the pilot light. If the furnace still does not work, the thermocouple may need to be replaced.

Dirty Flame Sensor

If the flame sensor is dirty the gas burner won’t stay lit. This will cause your furnace to cycle on and off.

Not Enough Gas

The gas supply to your furnace could have been cut off. The result is that your furnace will not have the gas needed to supply the warm air your asking of it. The furnace will even lock down in this instance for safety measures

Damaged Ducts

Your warm air goes through the ducts, but if your ventilation has holes in them they will let cold air come in contact with the air being blown into your home. Make sure to contact us and we can inspect the ductwork for you. This can help you have a warm and comfortable home this winter.

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