Im curious to know when your attic is at 90 f, what the outside temp. is at the time and if it was a totally sunny day ? Im in northern Florida and ive never measured my attic temp. but i strongly suspect that it is at least 90 f up there when its 60 f. out due to the intense suns rays beating on my black asphalt shingles. This winter ill pay closer attention to that and just may implement something like you have to take advantage of the accumulated heat up there for the living room area where i spend nearly all my waking hours. During the summer months, i wouldnt be surprised if my attic is at 130 f. at 6 pm which has me thinking I should throw a 300' coil of 3/4" Pex up there for shower water (cooling down with some cold water of course) .
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