I just purchased a 5 yr old home. It had one previous owner who lived there untill just recently. It appears my RUUD air conditioner isnt cooling correctly. When it is cool outside (70 degrees), the unit shoots out nice COLD air, but when its hot outside (85-90 degrees), it blows cool air 78 degrees is the coldest. I had a handy man my parents know come by and look at the unit. He cleaned the coils, checked the freon levels, hooked-up this mechanism to make sure the unit was operating properly. But he couldn't come to a solution. So what could it be? Also note, my next door neighbor has the exact same unit and same size home, but her home cools just fine.
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