Why Do A/C Units Freeze?

One of the most common air conditioner problems is the freezing of condensed vapor on or around the evaporator coils. This can be caused by one or more factors including bad airflow, dirty filters, refrigerant leak, or clogged coils.

Overland Park, KS ac_maintenanceFrozen water on the coils is a sign that the refrigerant is too cold, with little or no cold air being sent through the ducts to the outlet registers.

Most of these problems are too complex for the Overland Park homeowner to fix, so it is necessary to call in the services of a professional HVAC expert.

Below, we outline some of the reasons for a frozen A/C unit as well as explain why it is important to have the problem attended to immediately.

Refrigerant Is Too Cold

The refrigerant in an A/C unit is indeed very cold, but as it passes through the system, it absorbs heat energy. In fact, that is exactly what it is supposed to do.

When sent through the piping system, the refrigerant condenses and loses the heat it has absorbed. Should the evaporator coils become clogged with dirt, grime, or lint, the airflow becomes restricted.

Less air is available to warm up the refrigerant, and the result is ultra-cold pipes running through the evaporator coil. Ice builds up and eventually blocks the drain hole. The ice also expands and can break apart the coil unit. If ice begins to form on the coils, it’s time to call us to schedule a repair.

Fan Motor Is Beginning To Fail

The motor that drives the fan must be kept in top running condition. If it begins to run more slowly, the airflow is restricted. The coils will remain too cold, and the condensation will begin to freeze, forming a layer of ice on the unit. It’s important to have a professional repair tech look at the motor and see if it is the cause of the problem.

Remember, replacing the motor is a job for a professional who can determine the proper size and electrical power draw for the replacement unit.

Blocked Airflow Ducts

If the air ducts accumulate a large amount of debris in your Overland Park home, the airflow is restricted. It doesn’t matter if the fan is operating normally. The back-flow pressure will cause less suction in and around the evaporator coil, and this will lead to freezing of the condensed moisture.

A sheen of ice will form on the evaporator coils. This problem requires the assistance of a HVAC specialist who will clean out the air ducts and make minor repairs to them.

Call Us For Prompt, Reliable Service

We are specialists in the repair and maintenance of air conditioning units for home and business. For immediate emergency service or maintenance, call Priced Right Heating & Cooling at (913) 713-5911 today to get a technician over to your Overland Park, KS home!