Is your heater blowing cold air instead of warm air? If so, you're not alone, as this is a fairly common issue. But why does it happen, and how can you fix it? From a faulty thermostat to pilot light issues, understanding the reasons for a heating unit blowing cold air can help you fix the issue quickly and affordably. Keep reading to find out more.


Compressor Issues


If your heater is blowing cold air, it could be a sign of a bad compressor. A bad compressor can have a significant impact on the overall performance of the system, so it is important to diagnose and address the problem as soon as possible. The compressor is the piece of the heater that circulates and compresses the refrigerant in order to move the heat from one place to another.

When a compressor is bad, it means that it is not able to compress refrigerant effectively. Without a functioning compressor, the refrigerant is unable to move, and therefore, the heat pump is unable to provide heat as it should. If you suspect a compressor issue, you should call an HVAC technician to inspect your equipment.


Thermostat Problems


A heater that is blowing cold air could have a problem communicating with your home thermostat. The thermostat is the control center of your HVAC system, and if it’s not functioning properly, it can cause your heater to blow cold air.

First, you should check to see if your thermostat is set to “heat.” If it’s set to “cool,” then it won’t activate the heater when you turn it on. Next, make sure the thermostat is set to the correct temperature. If it’s set too low, then the heater won’t kick on until the temperature inside drops below the thermostat setting. Finally, make sure the thermostat is getting power. Dead batteries or faulty wiring could cause the thermostat to malfunction, and it won’t be able to activate the heater.

Dirty Air Filter

Air filters help to keep dust, dirt, and other airborne particles from entering your home. Over time, these filters can become clogged and impede the flow of air from the outside to the inside. When this happens, the heat pump won’t be able to produce enough warm air to heat your home. Additionally, a dirty air filter will also place extra strain on the system’s components, which can cause them to fail prematurely.

The good news is that this issue is relatively easy to fix. All you need to do is replace the air filter with a new, clean one. This should be done at least once every three months or more frequently if you have pets or live in an area with high levels of air pollution. A clean air filter helps to prevent the buildup of dust and debris, which can reduce the system's efficiency and lead to poor indoor air quality. It’s also important to make sure that the filter is the correct size for your heat pump, or it won’t be able to do its job properly.

Pilot Light Issues


Pilot light issues are one of the most common reasons that your heater might be blowing cold air. A pilot light is a small, continuously burning flame that is used to ignite the burner in a furnace. When the pilot light goes out, the heater will not be able to operate, as the burner won’t be ignited. While the blower might come on, it will produce cold air.

A pilot light can go out for a few different reasons. Most commonly, the pilot light has gone out due to a draft in the room. This could be due to a window being open, a fan running, or a door being opened and closed too frequently. The draft can cause the pilot light to go out.

Additionally, the thermocouple can be the culprit of a pilot light going out. The thermocouple is a metal rod that is connected to the gas valve and detects heat from the pilot light. If the thermocouple is not working correctly, the furnace will not be able to detect the heat from the pilot light, and the pilot light will go out.

Overall, understanding the reasons that your heater is blowing cold air is important in order to prevent expensive repair costs and major inconvenience. Taking the time to inspect the system, thermostat, and air filters can help diagnose the problem and solve it promptly.