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  • O’Fallon, IL HVAC: Why is my air conditioner frozen?

    July 9, 2018 | Blog
  • O’Fallon, Illinois is known for its hot summers, and an air conditioner that works properly is essential for getting through those steamy days. Unfortunately, extreme heat can put your air conditioner into overdrive, causing it to work around the clock. Everything is fine; that is, until you walk outside and discover that your unit is covered in ice. Here are three common reasons that air conditioners freeze up as well as a few tips for dealing with the problem.

    Not Enough Refrigerant

    Refrigerant has an important job. It takes the warm air inside of your home and moves it outside. However, over time, normal wear and tear can lead to refrigerant leaks. Not only does this take a toll on your unit’s efficiency, but it can also result in it freezing. When your air conditioner is low on refrigerant or has a refrigerant leak, the cold coil may get too cold, allowing moisture in the air to accumulate and freeze. If the air is especially humid or if the coils are dirty, the problem is amplified.

    Blocked Air Flow

    Dirty filters, damaged blower motors, and dirt buildup on the evaporator coil all greatly inhibit air flow. Not only do these factors cause your air conditioner to work harder and less efficiently, but they can also cause your unit to freeze up.


    Sometimes the problem isn’t the unit itself; your thermostat may be to blame. Most outdoor units do not function well at temperatures below 60 degrees, so if your nighttime temperatures are low and your thermostat is set too low or is faulty, your unit will not operate properly and may freeze.

    Steps to Take if Your A/C Unit Freezes

    • First, turn off your unit and let it completely defrost. If you allow the unit to continue running, you risk damage to the compressor, which is the most expensive part of the unit to replace.
    • Next, clean or replace any filters and remove any dirt or obstructions that you can see.
    • Ensure that all registers are open and are not blocked by furniture or draperies.
    • Lastly, give the experts at Dependable Service Repair Inc. a call. Your unit needs an inspection to ensure that there are no leaks or other damage to the unit.

    Routine maintenance on your air conditioning unit can help you avoid many problems. Contact us today to learn more about our air conditioning maintenance and repairs services.