What Causes an Air Conditioner to Freeze Up?

An outdoor central AC unit with ice on it.

Central air conditioning is a crucial aspect of many homes, especially during the hot summer days. As you may know, these cooling systems work by extracting hot air from indoor spaces, cooling it down, and then circulating it back into the room as cold air. Unfortunately, sometimes air conditioners freeze up, which can cause them to malfunction and fail to circulate cool air properly.

Understanding what causes an air conditioner to freeze up is imperative for identifying and fixing the problem. If you’re ready to learn more about what causes this frustrating issue, let’s go over everything you need to know.

Reasons Why Your AC Freezes Up

A central air conditioning system has several components, including the compressor, evaporator coil, and refrigerant lines. All of these essential parts work in tandem to cool your home and improve your family’s comfort. However, there are specific reasons why each of these components can be what causes an air conditioner to freeze up.

Clogged Air Filter

Many types of HVAC systems require air filters, which are designed to trap and remove contaminants from the air. Unfortunately, a dirty air filter can restrict the airflow through your HVAC system, causing your AC unit to freeze up. When the filter becomes dirty, this can block airflow and cause the evaporator coil to get too cold, which can lead to a frozen AC unit.

As a general rule of thumb, many HVAC professionals recommend replacing the air filter every 90 days. However, you’ll want to make sure that you change your filters according to the manufacturer’s instructions. Dirty or clogged air filters can reduce air quality, reduce efficiency, and lead to system failure, causing more significant problems in the future.

Low Refrigerant Levels

Refrigerant plays a vital role in keeping your AC system running and regularly circulating cold air. However, if the refrigerant levels are low or there’s a leak in the hoses, this issue could possibly be what causes an air conditioner to freeze up.

It’s essential to have a professional HVAC technician inspect the unit and fix any refrigerant leaks so that your air conditioner works efficiently and effectively. If you need an AC repair in Simi Valley, don’t hesitate to call our experts for help.

Dirty Evaporator Coil

A dirty evaporator coil could also be one of the reasons why your AC freezes up. This crucial component is responsible for absorbing heat from the indoor air, allowing the AC system to supply cool air. However, if the evaporator coil gets dirty, it can impede airflow and result in the coil freezing. All-in-all, cleaning your evaporator coils is crucial to maintain efficient airflow and prevent freezing issues.

Cold Refrigerant

If the refrigerant flowing through your AC unit is too cold, this can potentially cause the evaporator coil to freeze. If you suspect this is the case for you, you should contact an HVAC professional to inspect the AC unit. An HVAC technician can assess the refrigerant levels and adjust the temperature to prevent cooling issues from appearing in the future.

Airflow Problems

Airflow is central to keeping your AC unit working correctly. If there are restrictions or blockages in the airflow, it can cause the air conditioning unit to freeze. Common culprits behind this problem are dirty or clogged air filters and other obstructions in the ductwork. Proper maintenance of your cooling system can help you avoid these issues.

Schedule Your AC Repair in Simi Valley, CA

It’s important to know about the potential reasons why your AC freezes up. This way, you can act quickly and properly address the problem.

Has ice formed on your central air conditioning system? If you think you may need a comprehensive HVAC repair in Simi Valley, Calabasas, Westlake Village, or neighboring communities, turn to the experts at RR Electric, Heating & Air. We understand that it’s essential to make sure your AC unit is operating properly and providing cool air to maintain a comfortable environment. Contact us today to schedule an appointment!