Why Is My AC Blowing Warm Air?

Posted On: June 30, 2021

Now that temperatures are really heating up and summer is in full swing, your AC unit is going to be put to the test. The hotter the temps, the harder they work to keep us cool!

One issue that often occurs in the hottest months is your HVAC system blowing out warm air, instead of cool. There are some top reasons this occurs, and we wanted to shed light on them so you are aware and can get your system working properly!

Common Reasons For Air Conditioners Blowing Warm Air

Here are some of the most common reasons that air conditioning units blow warm air:

  1. Thermostat setting errors – This is a simple fix if you find your AC blowing warm air. Your thermostat might have the blower fan set to ON instead of AUTO, which will cause it to run all the time, not just during the cooling cycle. In between these cooling cycles, warm air will be blown from the vents. Try switching your thermostat’s settings or calling an SPHA technician to ensure you have your thermostat set to your family’s schedule and preferences.
  2. Dirty air filters – It’s so important to change your filters every couple of months. Take a look at your system’s manual or ask Short Pump Heating & Air to look at your system and recommend the frequency of cleaning or changing your filters.  A dirty air filter can’t properly move air through your system and home, which can then cause warm air to come out of the vents.
  3. A refrigerant leak – If there’s a leak in refrigerant, your AC doesn’t have the right charge to complete its cooling cycles. If you think this is the reason for warm air blowing into your home, give Short Pump Heating & Air a call and one of our expert technicians will come and repair it so your system can function properly.
  4. Frozen evaporator coil – All HVAC systems have evaporator coils, whose main job is to extract heat from your home’s air flow and start the process of cooling. As a result of this, condensation can form that is supposed to land in your system’s drip pan. Sometimes, this moisture collects on the evaporator coils, causing them to freeze and ultimately prevent the transfer of heat. Warm air will start blowing out of your system if this happens and your best option is to call Short Pump Heating & Air to come help make this repair.

Some of these are easy fixes, but some take a licensed HVAC professional to repair properly. When in doubt, contact Short Pump Heating & Air at 804-364-9040 to come out and take a look. We’ll talk you through any questions you have or send any of our expert technicians out to get you back up and running!

FREE Estimates on New Systems
  • This field is for validation purposes and should be left unchanged.
OUR REVIEWS