Help! Why Is My Heater Blowing Cold Air?

Help! Why Is My Heater Blowing Cold Air?

Your home’s heating system is made up of various components that all need to work together to provide warmth you and your family desire. Any time one of these parts isn’t working properly, you could end up with cool air flowing through the vents. Here are a few potential reasons your heater is blowing cold air.

Lack of Fuel

Every furnace needs a fuel source, whether it’s oil, gas or electric. If there’s no oil in the tank, the furnace won’t supply heat. If it’s a gas system, the valves must be working properly to supply the furnace with fuel. Breakers must be in good working order when it comes to electric systems. Oftentimes, furnaces will blow cold air when there is a block in the fuel source.


The thermostat could be the potential problem if your system is blowing cold air. Your thermostat should be set for heating, and it needs to be set to a higher temperature than your home’s current temperature. If the home is 65 degrees, the system won’t respond to a call for heat if it’s set at 65 degrees. Batteries should be changed to ensure low battery levels aren’t causing your home’s heating to malfunction. When batteries are low, the thermostat is unable to communicate with the furnace and therefore won’t supply warmer air.

Damaged Ductwork

If there are holes in the ductwork due to broken seals or improper installation, the furnace may be working, but the heat still isn’t reaching the vents. Cold air could be leaking into the ductwork, allowing hot air to escape. If your ductwork is damaged, you’ll feel cool air coming from your vents instead of the warm air being produced by the furnace.

Cleaning and Maintenance

Before the start of the heating season, maintenance should be done on your home’s furnace. It’s important to check and replace your filters on a regular basis. Old, dirty filters can block airflow and cause your system’s burner to shut down, both of which can make it tough or impossible to heat a space. In addition, you’ll want to make sure maintenance is done to check for a dirty fan or clogged condensate pump. Either of these issues can also prevent the burners in your HVAC system from functioning properly.

Call Air Tech of Central Florida to Restore Comfort to Your Home

When you have cold air blowing through your home’s vents, you’ll need an experienced professional to diagnose and fix the problem with your furnace. Air Tech of Central Florida has been serving Central Florida residents since 1998, and our team of NATE certified technicians are here to help solve any of your heating and cooling needs. Call us today or schedule service online to get started.

Share Post: