Furnace Blowing Cold Air On Heat Setting

For a heat pump or heater to produce warm air air must flow easily through the filter.

Furnace blowing cold air on heat setting.

Have an expert inspect your ducts along with the furnace. What causes a furnace to blow cold air. Well if your furnace is blowing cold air it s most likely due to one of these problems. You have leaky air ducts.

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. 2 clogged air filter. Gas is not being supplied to the unit. When set to on the fan on your furnace will blow continually even when the furnace isn t actually heating the air.

The thermostat is set to on if you notice your furnace is blowing hot air some of the time and cold the rest of the time your fan is most likely set to on when the. Change the air filter a dirty air filter restricts airflow into your furnace. Furnaces use gas and heat pumps use electricity to generate heat. Your fan limit switch settings need to be adjusted.

Your furnace is overheating. 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. The furnace has overheated. A dirty air filter blocks airflow over the furnace s heat exchanger causing it to overheat.

Your furnace may be blowing cold air because the filter is too dirty. If your furnace starts blowing warm but then quickly turns cold the flame sensor may need attention. 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. Your thermostat settings need to be adjusted.

Your thermostat is set to on the pilot light is out. A furnace that is blowing cold air is most likely due to one of four possible causes. So how do you know which problem is causing your furnace to blow cool air.