If your furnace overheats it could end up blowing cold air. Your furnace blowing cold air could be caused by hot air escaping through holes in the duct work that carries the heat throughout your building.
Gasfurnace Sometimes Referred To As Forced Air Systems These Heating Systems Burn Nat Refrigeration And Air Conditioning Hvac Air Conditioning Gas Furnace
Change the air filter.
Why is my furnace blowing cold air. If your furnace starts blowing warm but then quickly turns cold. In such cases a safety control device known as the limit switch will shut off the burners. However the fan will keep running cooling the furnace.
Have an expert inspect your ducts along with the furnace.
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