This may seem counterintuitive.Air conditionersare supposed to cool theinsideof your house.

So why does the outside look like an old frosted-up freezer?

It’s even possible you simply need to adjust the controls on the appliance.

air conditioner window unit

The Spruce / Candace Madonna

Then, it’s pumped outdoors and compressed so that its heat is radiated outdoors.

Here are seven common reasons why a window air conditioner might freeze up during operation.

The solution to blocked coils is usually nothing more complicated thana good cleaning.

Wipe off the fan blades on the large fan at the rear of the unit.

If the coil fins are badly bent, straighten them with afin comb.

Be sure to clean the filter at the front of the unit.

The filter helps keep the coils clean and should be checked and/or cleaned monthly during the cooling season.

confirm that air can flow freely in and out of your appliance.

Often, it’s enough just to turn up the fan speed to stop ice buildup.

Lower airflow through the system can help the unit dehumidify more effectively.

As a general rule, air conditioners are designed to cool most efficiently to about 68 degrees.

They can go colder, but setting the temperature way down can cause the unit to freeze up.

An oversized AC often short-cycles, turning on and off frequently.

Instead, the temperature may linger just above the level that would cause the AC to automatically shut off.

Because the coil stays continually cool, condensed moisture eventually begins an ice buildup.

Unfortunately, a bad compressor isn’t usually fixable and will need to be replaced.