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Why Does My Air Conditioner Keep Freezing?

Posted on AC Maintenance, AC Repair, AC Tips, The Cooler Blog June 9, 2014

During the summer months, it’s common for air conditioning units to freeze up with a coat of ice around the copper pipe. This can happen for a variety of reasons:

  1. Insufficient refrigerant: Lack of refrigerant from a leak can cause your AC to freeze
  2. Low thermostat: Setting your thermostat too low can cause air conditioners to freeze up
  3. Blocked vents: When vents are blocked or closed, airflow is consequently blocked and this can cause you AC to freeze up
  4. Faulty fan: If your AC’s fan is broken, air will not circulate through the ductwork, which can cause the air conditioner to freeze
  5. Dirty filters: If your AC unit’s filter is dirty, it can block airflow and cause you air condition to freeze

If your AC is frozen up, make sure to:

  1. Turn off your thermostat so your AC can defrost
  2. Clean or replace your filter if you see it’s dirty
  3. And if you’re still having problems, call an AC professional


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