When Cool Turns Hot: Why Your Air Conditioner Is Blowing Hot Air

Atlantic Refrigeration • September 8, 2025

When an air conditioner doesn’t blow cool air, you’re forced to suffer through stuffy rooms, heat and the headache of finding out what’s wrong. Luckily, there are some common repairs that a technician can make that often resolve the issue. If your AC isn’t working properly and is blowing hot air, here are some potential causes and solutions.

Dirty Air Filter

The least costly and time-consuming repair is an air filter replacement. When air filters get too dirty, they clog the system and can cause the evaporator coils to freeze over. When this happens, restricted airflow and stalled coils result in warm air leaving your vents. Changing the filter is a task that you can perform yourself.


Experts recommend you change filters every 90 days. If your household is large, you should consider completing this task once per month.

Low Refrigerant Levels

Older AC models are more likely to have this issue, but newer models sometimes develop leaks that lower the levels of refrigerant in the system. This specialized cooling liquid is necessary to turn hot air cool before it’s blown into your home. A technician can identify the cause of your low refrigerant levels and replenish them to make your AC run as good as new.

Frozen Evaporator Coils

The evaporator coils may freeze over if there is a dirty air filter or there isn’t enough refrigerant. In any case, this is the leading cause of hot air coming out of an AC. The technician can examine the coils, thaw them and ensure your system components are all working as they should to get your AC back in top shape.

Electrical Problems

Many electrical issues can cause your AC to go haywire, including miscalibration and issues with the motor blower. If there’s an electrical malfunction, it’s always best to let an expert handle the job. They know how to inspect each individual piece as well as the system as a whole to diagnose and repair issues.

Faulty Compressor or Fan Motor

The compressor and fan motor are both critical parts of any air conditioning system. When they shut down or break, you’ll likely stop receiving cool air no matter how much you lower the thermostat. These are major elements of your AC that require professional inspection and service.

Thermostat Problems

Sometimes, thermostats fall out of sync with the AC, causing it to blow warmer air than it should. In other cases, it may lose connection altogether and stop triggering the right temperature. Thermostat calibration is part of a typical AC tune-up, but you can also call the pros anytime to take a look at your system if it isn’t responding to your commands.


If you have problems with your AC that simple troubleshooting won’t fix, don’t delay in getting help. Get expert AC installation and repair services from Atlantic Refrigeration in Delray Beach so that you never have to go a day without the comfort of AC.

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