Another big air leak is on models with a side mount A/C unit. I pulled mine out a few weeks ago, and the actual A/C unit only faces up against about 2/3 of the outer vent cover. What's behind the other 1/3? Absolutely nothing. It's a big hole, allowing air to rush inside, seeping around the A/C unit and the cabinet joints and into the inside of the trailer. I may cover it with some styrofoam insulation, but that will be far from perfect.
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