Why is my heating unit blowing cold air?

Your furnace may be blowing cold air because the filter is too dirty. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. 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.

Why does the air blower blow when the AC is on?

If your thermostat switch is set to ON, that means the blower will run constantly—even when your system isn’t cooling your home, which will result in warm air blowing from your vents. How to fix it:Switch your thermostat to AUTO (see image below), so air only blows from your vents when the AC is cooling. 2. Your air filter isn’t dirty.

What does it mean when your AC is running but not Cooling Your House?

Your thermostat is switched to ON. If your thermostat switch is set to ON, that means the blower will run constantly—even when your system isn’t cooling your home, which will result in warm air blowing from your vents. How to fix it: Switch your thermostat to AUTO (see image below), so air only blows from your vents when the AC is cooling.

Why does the fan blow when the furnace is off?

When set to “on”, the fan on your furnace will blow continually, even when the furnace isn’t actually heating the air. 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. A dirty air filter restricts airflow into your furnace.

What to do when your furnace is blowing cold air?

If you notice cool air blowing and/or your furnace frequently turning off, a simple air filter replacement may do the trick. Do this: Regularly replace your air filter. When your air vents are closed or blocked by furniture or drapes, the furnace can overheat like it does with a clogged air filter.

Why is my heating system blowing cold air?

For example, if you have your thermostat set on the ”on” position instead of “auto”, the furnace will continually run, even if it isn’t on the heat cycle,. In that case cool air will be running through the system This just means a simple thermostat adjustment.

What kind of air does a heat pump blow?

Heat pump blowing cold air: Furnaces tend to put out about 130 to 140 degree air. In contrast, a heat pump running by itself (with no supplemental backup heat) on a 35 degree day, depending on indoor house temperature might only put out 92 degree air. On a 20 degree day, it might drop to 85 degrees.

What to do if your heat pump is running but your air conditioner is on?

In either case, you’ll need to bring in a professional. Broken reversing valve: If your heat pump is running, but the air coming out of your vents is hot, it’s likely a problem with your reversing valve. Again, this is the part of the heat pump that reverses the refrigerant and allows it to act as both a heater and an air conditioner.