Why Your Home Air Conditioning Unit Frosts Over | A.J. Perri NJ HVAC Skip to content

What causes your air conditioning unit to frost over?

Air conditioners work by moving warm air over the cooling coil (also know as the evaporator coil). This process removes moisture from the air, which accumulates in the collector pan. This process is also key to maintaining a comfortable environment for your home in the summer.

If the air moves too slowly over the evaporator coils or if the refrigerant in your system is low you run the risk of the coil developing frost and icing over. A frozen unit will not be able to cool your home properly.

A frozen unit can be the result of low refrigerant or a dirty filter or coils. You can help avoid these problems by scheduling annual maintenance and changing or cleaning your air filter on a regular basis. During a maintenance check-up your technician will clean dirty coils and changing or cleaning your filter ensures proper airflow through your system. If your refrigerant is low, this could be an indication that you have a leak. Contact a professional technician to check for proper refrigerant levels and leaks.