5 Simple Reasons Your Heater Is Blowing Cold Air


While the rest of the country is suffering from the chilly winter air, here in Birmingham we’re enjoying a little bit of warm weather. But, we all know that can change at any second! This time of year you want your heater to be in peak condition to ensure that you’re toasty warm on those suddenly chilly days.

Unfortunately, sometimes you turn on your heater to find only cold air blowing. What’s up with that? Before you pick up the phone and call a service tech, check these five common causes that might make your hot air turn cold.


The Heater Was Just Turned On.

Sometimes the air in your home is so cold that all you want is heat…now! In reality, heaters take a few moments to heat up when you turn them on. If you just flipped the switch to heat your home, have a little patience. If you still aren’t feeling any hot air after 10-15 minutes, there is a more significant problem at play.


The Fan May Be Set to “On,” Not “Auto.”

The next culprit may be the fan setting on your thermostat. Is the fan set to “on?” If so, it means that your HVAC fan will constantly run, even if the heater is turned off. To fix this issue, switch the fan to “auto.” This ensures that the fan only runs when the heater turns on and starts pumping warmer air throughout your home.


The Thermostat Batteries are Dying.  

If the fan setting is fine, check the thermostat batteries. When was the last time you replaced them? Many home owners don’t even know that thermostats have batteries – the assumption is that they are hard-wired into the home’s electrical system. Dying batteries can cause the thermostat to malfunction which, in turn, causes the rest of the HVAC system to have issues. If you haven’t replaced the batteries recently, give this a try and see if your heat comes back.


The Filter is Clogged.

When was the last time you changed your HVAC filter? If it has been more than 30 days, now is the time to double check its condition. When an HVAC filter is clogged, it restricts airflow through the system. That means all that nice, warm air is spending too much time stuck in your system instead of being blown throughout your home. By the time it makes its way into your living spaces, it has lost its heating power. If your filter is clogged, a replacement filter should fix the issue.


The Pilot Light is Out.

If you have a cold air problem and own a gas furnace, now is the time to check your pilot light. A pilot light is a small flame that continually runs, allowing for the ignition of gas to produce heat. Sometimes, usually on older model furnaces, the pilot light burns out. There are a few ways the light can accidentally go out, but once it’s off, no more heat will flow through your home until it is on again. Each furnace is slightly different, so to restart the pilot light check your furnace’s owner’s manual for more information.


Is your heater still not blowing hot air? It’s time to call a professional. Give us a call at (205) 871-8111 to schedule an appointment today.