How do I Fix Freezing up of AC Units?

If you notice that your air conditioner isn't running as well as it should, the first problem for which you should check is freezing of the unit.

A frozen air conditioner can cause a miserable summer.A frozen air conditioner can cause a miserable summer.
This is an occurrence that can be caused by a number of reasons, such as not enough air going through the system, a dirty air filter, the refrigeration unit having a leak or the temperature outside being too low. You can take a few steps to defrost your air conditioner and get it back in working order.

Turn the air conditioner off. This will give it a chance to defrost on its own.

Turn on the heating unit. Most air conditioners also contain heat pumps and can work to both heat and cool a structure. Depending on the model of heat pump in your home, there should be a switch on the unit to change the setting to "Heat" from "Cool." If you're not sure how to do this, see your owner's manual for details.

Remove the cover of the unit and check for any debris or dirt. Clean as much as possible using your hands and a towel or rag.

Check the tubing to see if anything has been disconnected or damaged. If the air isn't getting through the unit properly, that could cause it to freeze up.

Check the air filter to see whether it needs to be replaced, and replace if it's dirty or hasn't been changed in some time.

Things You Will Need

  • Replacement air filter
  • Replacement tubing
  • Cleaning rag

Tip

  • Turn off your air conditioner when it's cool outside to keep it from freezing.