When temperatures drop in Trussville, AL, the last thing you want is a furnace that’s pushing out cold air instead of keeping your home warm and cozy. If this is happening, don’t panic—there are a number of possible reasons behind it. Some can be fixed with simple troubleshooting, while others may require professional repair.
Let’s take a look at some of the most common causes and what you can do to get your furnace back on track.
Start with Your Thermostat
Before assuming there’s a mechanical issue, check your thermostat settings. A surprisingly common reason for cold air is that the thermostat is set to “ON” instead of “AUTO.” When set to “ON,” the blower runs continuously—even when the furnace isn’t heating—making it feel like cold air is blowing through your vents.
Overheating Could Be the Culprit
Your furnace is designed with safety features that shut off the burners if the system overheats. When this happens, the fan continues running, but only cold air comes out until the system cools down.
A dirty air filter is one of the most common causes of overheating. When dust and debris build up, they restrict airflow, forcing the furnace to work harder and potentially triggering a shutdown. To keep your system from overheating, replace your air filter every one to three months and make sure all vents are open and unblocked.
Leaky Air Ducts Might Be to Blame
Even if your furnace is working fine, leaks or damage in your ductwork can let warm air escape before it reaches your living space. As a result, you may feel like your furnace is blowing cold air, even though the heating system itself is functioning properly. If you suspect duct issues, it’s best to schedule an inspection to determine if repairs or sealing are needed.
When to Call an HVAC Professional in Trussville, AL
If you’ve checked your thermostat, air filter, and ductwork but your furnace is still blowing cold air, it’s time to call in the experts. Ignoring the issue could lead to bigger problems, higher energy costs, and a chilly home.
For reliable furnace repair in Trussville, AL, contact Alabama Cooling and Heating today. We’ll help keep your home warm and comfortable all winter long.