How do I stop my home AC from freezing up?

To sum up, here’s what you need to do to prevent the A/C from freezing:

Have the refrigerant level checked.
Change the filter monthly.
Keep the supply vents open.
Have the fan speed increased.
Have the thermostat checked out.
Inspect the condensate drain weekly.
Make sure any window units you have are angled correctly.

Why is my AC freezing up in my house?

Low refrigerant levels are a surprisingly common culprit when it comes to ice buildup on air-conditioning systems. As the unit attempts to operate with less refrigerant than intended, the resulting drop in pressure can cause evaporator-coil temperatures to dip below freezing.

How do you fix a frozen air conditioner?

How Do You Fix a Frozen Air Conditioner?

Examine the Vent Filters. Check the vent filters to see if they are clogged and restricting air flow.
Inspect the Coils and Fins. You can also inspect the coils and cooling fins around the evaporator to see if they need cleaning.
Check Coolant Levels.
Reset the Power.

Why does my AC freeze up on hot days?

There are two main factors that contribute to an air conditioner freezing over: airflow and a dirty coil. First, as we explained before, dirty coils can’t absorb and transfer heat at the same rate as a clean coil, and thus the refrigerant that flows through the coil will constantly remain at a sub-freezing temperature.