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As Mo-Mike said, after removing the cover feel the air coming directly out of the blower and compare to what you feel out of the roof vents and that will tell you how well insulated your ducts are. Remember to multiply that difference by the number of vents you have because that is where all that cooler air is going. A vent below the blower was the fix for me, but my unit is only 24 feet. That and turning it into an igloo as LWR describes with the bubbles on the windows keeps me cool.
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