A very strict cycle of heavy night time venting with whole house fan and closing up during he day last summer in my very air tight well insulated cabin kept temps well cooler than outside(as comfortable as AC) all day but lead to some heavy mildewing of leather items and some fabrics in storage areas where humidity condensed and air flow was stagnated. So natural night cooling can be overdone. Could use dehumidifier but that is a power demand I would not like to add. May have had more humid period last summer then normal. But I think that I was night cooling to near dew point inside during the day to much.
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