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Why is your AC unit freezing up?

Updated: 9/11/2023
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โˆ™ 12y ago

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There's 2 reasons for a/c units to freeze up.lack of freon,lack of air flow.the lack of freon doesnt always mean the level is low,it means its low for the application.if the temp of the air your trying to cool is low,it uses more freon to bring the temp down even more.......your unit can freeze even with the proper charge if the unit is running more than it should if you have a bad stat ot a stuck contactor the unit will freeze just as it would if the freon level is low.........make sure your outside unit is shutting off when the tstat says it should

The information above is inaccurate, though yes low freon charge can cause it to freeze, but not the way described above. First off always make sure the size of the unit is appropriate for the size of the room. This is measured in BTU's or British Thermal Units. If the unit is too small it will run excessively and cool poorly, if it is too big it could be more costly to run than necessary. The biggest causes I have encountered are poor airflow and dirty evaporator core and/or condensation drainage passages. Make sure to keep the filter clean and keep the fins clean and straight. Use compressed air to clean out the evaporator and drainage passages, and use a water hose to clean the case and condenser. Make sure moisture can drain easily off of the evaporator, if it sits there too long the freon will turn it into an ice block pretty quickly. If you have done this and are still having problems you should contact your local licensed professional as these freons are hazardous chemicals and can only be handled by certified professionals.

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Q: Why is your AC unit freezing up?
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