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What causes AC Units to freeze up ?

  • The biggest reason is a dirty air filter. Over time your air filter catches pollutants and others dust particles, once this builds up it restricts the overall air flow, as a result condensation from the air’s humidity will start freezing over the AC coils instead of dripping into the drip pan.
  • Arefrigerant leak — If the refrigerant level is too low it will cause your evaporator coils to become too cold. Air that comes in contact with your evaporator coil will then end up freezing.
  • Problems with your AC’s fans cause cause the AC unit to freeze up.
  • Dirty air ducts will block airflow and also cause part of your AC unit to freeze up.

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