Furnace Blowing Cold Air On Heat Setting

7 reasons your heater blows cold air ac blows hot air 1 dead batteries in thermostat.

Furnace blowing cold air on heat setting.

A furnace that is blowing cold air is most likely due to one of four possible causes. When set to on the fan on your furnace will blow continually even when the furnace isn t actually heating the air. Yeah that s a lot of possibilities. 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.

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. You have leaky air ducts. Have an expert inspect your ducts along with the furnace. Your thermostat settings need to be adjusted.

Furnaces use gas and heat pumps use electricity to generate heat. Change the air filter a dirty air filter restricts airflow into your furnace. Gas is not being supplied to the unit. Your furnace may be blowing cold air because the filter is too dirty.

So how do you know which problem is causing your furnace to blow cool air. 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. What causes a furnace to blow cold air. Your thermostat is set to on the pilot light is out.

Seems silly but you d be surprised how often this has happened. For a heat pump or heater to produce warm air air must flow easily through the filter. Your fan limit switch settings need to be adjusted. 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.

A dirty air filter blocks airflow over the furnace s heat exchanger causing it to overheat. The furnace has overheated. Well if your furnace is blowing cold air it s most likely due to one of these problems.