Electric Furnace Blowing Cold Air

Auto ensures that the blower will run only when the furnace heats the 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. This safety mechanism protects your furnace from overheating and the damage that causes.

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There are incidentally some common causes for why your furnace may be blowing cold air instead of warm and what you can do to fix the problem.

Electric furnace blowing cold air. Check the furnace s air filter. A dirty air filter restricts airflow into your furnace. If your furnace starts blowing warm but then quickly turns cold the flame sensor may need attention. Have an expert inspect your ducts along with the furnace.

One of the most frustrating issues you can face in your home is finding yourself with a furnace blowing cold air. A dirty air filter blocks airflow over the furnace s heat exchanger causing it to overheat. Your furnace blows hot air but that air quickly turns cold then the furnace shuts off altogether. So change the air filter if it s dirty.

If your furnace is overheating that means your heat exchanger is getting too hot. Although the furnace may be sending heated air into the ductwork by the time it gets to the registers it may only be cool air blowing out. Your furnace may be blowing cold air because the filter is too dirty. Holes broken or unhooked ductwork causes cold air to bleed into the duct system.

If you notice your furnace only blows cold air on occasion but your home is still maintaining its temperature than this may be simply a setting on your thermostat. One of the most common causes of a furnace blowing cold air is not actually a repair at all. Change the air filter. Restricted airflow can overheat your furnace causing a safety control to shut off the burners.

So if you feel the air blowing out of the vents while the furnace is off the air will seem cool since it ll be at about room temperature. The fan setting on your thermostat has two options on and auto. When overheating your furnace can trip a high limit switch causing the furnace burners to shut off so that the heat exchanger does not crack. This hot then cold air sequence happens over and over and your home isn t warming up.