AC Blowing Hot Air

Posted on April 17th, 2018 by Brian Hall

If you’ve ever experienced a humid and sticky Florida summer, the last thing you want is your air conditioning unit blowing hot air and steam around your home. Your air conditioning system has 2 parts: an indoor unit that blows the air through your home and an outdoor unit that cools the air. If your outdoor unit isn’t getting power, your indoor unit may continue to run, blowing your home’s air in circles without cooling it off.

#1: Check Your Thermostat Settings

This may be overlooked by many, but double check that your thermostat is set to cool. Depending on the weather and other activities like having guests over, perhaps your thermostat was accidentally put on a different setting. If your fan is set to “ON” instead of “AUTO” it constantly runs regardless of whether the air conditioner is cooling the air. The warm air you feel is just the fan circulating lukewarm air when the AC is not running.

#2: Your Air Filter or Air Conditioner Is Dirty

A dirty air filter allows more contaminants to flow through your AC system. Dirt and dust eventually build on your evaporator coil (the coil that cools the air before it is pushed into your home). If the coil is caked with dirt it can’t do its job, meaning the air pushed through your vents will be warm instead of cool. Replace your air filter regularly, about once every month. Also, inspect your outdoor unit for grass clippings and other natural debris in the fins, which can be cleaned with a soft brush.

#3: Your Evaporator Coil Is Frozen

The air filter does an excellent job of removing solid particles from indoor air supply. However, when the air filter fills, less air passes through it while dirt and dust accumulate inside the system. Eventually, these pieces stick onto the evaporator coils and freeze into place. This freezing occurs because the unit leaks in 32 degrees Fahrenheit temperatures. Solve this air conditioning problem by preventing unit leaks and setting your programmable thermostat between 70 and 72 degrees Fahrenheit. In the short term, you can turn the unit off and let it thaw. Turn it on after about two hours, and if it’s still frozen, call Performance AC.

#4: Check the power supply to your outdoor unitCondenser

When you turn the AC on, do you hear the outdoor unit running? The power switch is accidentally turned off, or the plug is loose on the outdoor condenser. Even though your indoor fan may continue to run, the system won’t cool the air. Plug the unit back in or turn the switch on again. While you’re at it, if you have a heat pump, check the thermostat settings to ensure that your HVAC system is set to “cool” not “heat” and that the fan switch is on “auto”.


Although those are the most common reasons for why you’re getting hot air in your home, they may not be the only reasons. If you’re not sure, be sure to contact an HVAC professional at Performance AC to help you fix the issue.











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