AC Blowing Hot Air: How to Troubleshoot and Repair Your Air Conditioner - Polar Bear Air Conditioning |
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AC Blowing Hot Air: How to Troubleshoot and Repair Your Air Conditioner

Man using paper to fan himself due to broken air conditioner blowing out hot air in his Cayman Islands home.

The Cayman Islands is our paradise in the sun, but for homeowners whose ACs are blowing hot air, things are much less heavenly. Knowing how to troubleshoot and how to fix an AC that’s blowing warm air can help you prepare for times when the mercury rises but your AC can’t keep up.

Rising temperatures push AC systems to their limits. One of the most frequent complaints we get are reports of ACs blowing hot air—much to homeowners’ chagrin.

So, what is the root cause of an AC that’s blowing hot air? A primer on possible causes and their fixes can help you troubleshoot your system and learn how to fix your AC when it’s blowing warm air. Let’s take a look!

Refrigerant Leaks

One of the most common reasons for ACs blowing hot air is a refrigerant leak. If refrigerant leaks from your HVAC system, it cannot remove the heat from the air. As a result, you feel warm air coming through your vents. When there’s a refrigerant leak, you might notice hissing noises coming from your unit, frozen evaporator coils, and elevated electricity bills.

Human Error

Sometimes the simplest answer is the right one, and fixing an AC that’s blowing warm air is as simple as setting your thermostat to the correct level. 

No, it’s not unheard of for air conditioning techs to receive emergency AC repair requests and respond to calls of ACs blowing hot air only to realize that the homeowner has set the thermostat incorrectly. 

For instance, if the FAN setting on your AC thermostat is set to “ON” instead of being set to “AUTO,” then it will run continuously. When the system is between cooling cycles, the air coming from your vents may be warm. The easy fix is just to check your settings, making sure your fan is on “auto” and that you have selected “cool” and not “warm.”

Frozen Evaporator Coils

When poor airflow, blower motor damage, a refrigerant leak, or some other issues lead to the evaporator coils of your unit getting too cold, it can cause the coil to freeze. You can try using a heat gun or even a blow dryer to thaw frozen evaporator coils. However, addressing the root problem of why the coil temperature is below freezing can prevent it from happening in the future.

Dirty Air Filters 

One of the best things you can do for your HVAC system is to make sure its air filters are always clean. A dirty filter prevents the proper movement of air throughout your unit, which strains the AC in general and can lead to your AC blowing hot air.

Flipped Breakers 

If a breaker has tripped in your home’s electrical panel, then it can lead to incomplete or interrupted cooling cycles. Reset any tripped circuit breakers, look for blown fuses, and make sure that the power switch on the outdoor unit is actually on.

Reach Out to the Pros at Polar Bear

These tips can help you understand more about how to fix an AC blowing warm air. However, if you troubleshoot your system and still can’t figure out the issue, it’s time to call the pros.

While it’s tempting to do it yourself, the truth is the tools and equipment necessary for most repairs of ACs blowing hot air require professional training to use. Polar Bear’s air conditioning technicians offer AC repair in the Cayman Islands and have what it takes to fix AC units blowing warm air quickly and efficiently.


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