Hi and welcome to FixYa. I am Kelly. Freeze ups are caused by a couple things.
1. The first thing is a dirty evaporator coil. Air conditioners that run 24 hours a day should be thoroughly cleaned every 90 days.
2. The Blower fan wheel is dirty
3. The fan motor is not running fast enough.
Most of the time these 3 items listed above are the main reasons and Air Conditioner Freezes up.
Thanks for using FixYa,
Kelly
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