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Why Is My AC Unit Freezing Up?

What You Should Know

If your HVAC unit freezes up, you’ll probably notice a layer of ice or frost forming on it. This can happen any time of the year, regardless of the season, and it points to an underlying problem. The first thing you want to do is turn the system off until you pinpoint the issue, and call in a professional.


Over time, normal wear and tear can lead to refrigerant leaks, which cause your system to work improperly. Changes in pressure or an incorrect charge can also cause the coils containing the refrigerant to get too cold, and ice to form. A build up of ice affects the air flow, and prevents your system from doing its job. The ice could also melt and cause water damage to your unit as well.

Improper Airflow

If your unit isn’t getting enough air flow to operate properly, the coils can drop below freezing. In turn, humidity collects on the coils, and ice begins to form on your air conditioner. Always make sure you’re properly replacing your air filters, and inspecting vents around the home for air leaks. Dirty evaporator coils can also restrict airflow.

Blower Fan Issues

Your fan can become damaged during regular day-to-day operation. If the fan isn’t blowing fast enough (or at all), the right amount of air isn’t blowing over the evaporator coil. When this happens, your air conditioner cannot create cool air and push it out properly. This can, in turn, cause the unit to freeze up.

Conclusion: There are a variety of reasons your HVAC unit may be accumulating ice or working improperly. Have your HVAC technician check your unit to make any necessary repairs, and don’t forget to schedule preventative maintenance at least twice a year. Please visit us online or give us a call at 1-800-404-0371.

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