Air Conditioning Heating and Ventilation Services

Why is My Heater Blowing Cold Air?

It might be warming up here in Florida, but that doesn’t mean you should let it slide if your furnace is blowing cold air into your home. It could indicate a problem with your flame detector, gas supply, air filter, pilot light, or condensate lines.  


While some of the problems affecting your heater are easily solved, you must take care of them quickly on your own or with the help of a professional HVAC technician. Let’s explore some potential issues. 



Problems with Your Furnace  


If your furnace isn’t creating the heat that it’s supposed to, there are a variety of potential problems to blame. 


The Pilot Light is Damaged  


The first component to check if your furnace is blowing cold air is the pilot light on your gas system. This tiny flame ignites the burners so that your system can heat up. Older gas furnaces are particularly prone to problems.  


While you can relight it on your own, you can always call us at (813) 917-2982 or (727) 453-2432 if you need assistance.  


Dirt & Grime on the Flame Detector  

Some kinds of gas furnaces rely on a different method to activate the heating process: flame detectors. Over time, your flame detector may become covered in dust, dirt, or grime, which will lead to a loss of heat.  


The simple fix is to clean your flame sensor or reach out to our HVAC team to help you out.  


A Dirty Air Filter  


Your furnace air filter will also end up dirty from particles in your home, obstructing incoming air. Long heating cycles or overheating issues will cause your heater to blow cold air.  


Overheating can be hazardous, so switch out your filter as soon as possible. 


A Low Gas Supply  


If your furnace isn’t receiving enough gas to do its job, it will automatically shut off. This could indicate damage to your gas lines, which you will need a professional to repair. Don’t DIY this task! 


Clogged Condensate Lines  


Modern state-of-the-art furnaces are designed with condensate drain lines to remove moisture, but a blockage in these lines could deactivate your burners and result in cold air.  


Ductwork Damage 


If your ductwork has cracks, holes, or other kinds of damage, cold air from the attic may be able to enter. Even if your furnace is blowing warm air, it may all leak out by the time it reaches your rooms.  


We recommend scheduling a duct inspection and cleaning with one of our reliable HVAC pros.  


Your Thermostat is Set to On Instead of Auto  


If your furnace is toggled to On, it will blow air even when it’s not producing heat. By switching your thermostat to Auto, your furnace will only run while it’s heating. 


Learn More > On vs. Auto: How Should I Set My AC? 


ACHV Services Will Keep You Warm  


If you’re noticing cold air when your heater is turned on, it’s a good idea to schedule an inspection with ACHV Services. While there are ways you can troubleshoot on your own, our team will perform a thorough inspection so that no stone goes unturned. Reach out today! 

Share this post:

Related Posts