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I have a tempstar 5ton 13 seer a/c unit. It keeps freezing up. I have check the freon, the filter and even put a larger blower motor on it. What else could be the problem?

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The problems cold be to small a return air. I do a lot of cool surveys where I check the efficiency of the AC. Some people are putting in Heppa pleated filters and they realy restrict the air flow a great deal. You need at least 1.25 square feet of filter area per ton. 5 ton should have 24 by 36 return. Check to see if coil is dirty. Check air temp. across coil. From return to closest vent. Should be between 18 to 23 degress. Rusty

Posted on Jun 03, 2009

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