Why Is My Air Conditioner Blowing Hot Air?

Why is my furnace blowing cold air?
Why is My Furnace Blowing Cold Air?
April 27, 2018
HVAC Maintenance for Pet Owners
Home HVAC Care Tips For Pet Owners
July 9, 2018
Show all
Air Conditioner

Your air conditioner contains dozens of parts that all work together to efficiently cool your home. Just one part malfunctioning one cause problems with the whole system! The last thing you need in the heat of the summer is to have warm air coming out of your A/C unit.

Before you literally start sweating, check out the most common causes for an air conditioner blowing hot air that you may be able to diagnose and even fix on your own.

1. Your AC Unit is Frozen

It can come as a surprise, but air conditioners can actually freeze. This is one of the most common causes of air conditioners blowing warm or hot air. This happens because the inside has frozen into a block of ice.

The reason for the warm air blowing out is because the frozen part is the evaporator coil, which can block the cool air flowing into your home. Instead, the motor’s heat gives you a warm airflow, so as long as the fan is not frozen, all is well.

To fix this issue try turning it off and letting it thaw. After about an hour or two, it should be safe to turn back on. If it freezes again, you should contact a local air conditioning repair company, such as Crystal Heating and Cooling, to take a look at it.

2. Incorrect Thermostat Settings

As silly as it seems, it’s actually quite common for homeowners to forget that they have to switch their thermostat from “warm” to “cool”. It’s important to also make sure the unit’s temperature is not set too high on auto.

Make a note to yourself before the warmer months comes to turn your AC unit on “cool” mode. If you check your thermostat and the mode is set correctly, check the temperature and adjust it accordingly.

3. The Breaker Switch Has Blown

As with any appliance that requires power, your AC unit has a power supply, which also has an on/off switch that can be tripped by a bad breaker. Without power, the unit simply won’t turn on. Breakers often flip off when there is a power overload as a safety precaution.

To prevent this from happening, consult an electrician to ensure your breaker can handle the current draw of your unit. The fix for this issue is quite simple. Just flip the breaker back to the “on” position. If that does not work, contact an electrician.

4. Your Air Filter is Dirty

When was the last time you changed or cleaned the air filter in your AC unit? Most people never do until something goes wrong and it’s too late.

Are you guilty of not changing your air filters regularly? Sign up for our air filter subscription service!

Air filters get dirty and can block that clean cool air from entering your home. This blockage won’t clear up until you or a technician take it out and replace it.

Although the filter alone won’t cause warm air to blow, it will contribute to the problem and reduce cooling effectiveness significantly.

If you’ve checked for all of the causes mentioned above and you’re still finding that your air conditioning unit is blowing warm air, give Crystal Heating and Cooling a call and we will have you back up and running in no time. It’s no sweat!