Larry J. Messerly wrote: > air conditioned homes in Phoenix >have higher RH inside than outside in the summer. > >Larry Yes, of course. The refrigerated air can hold less water, increasing the relative humidity. The AC removes water from the air but not enough to keep the overall relative humidity of the building from rising. After all, at the point in the machinery where water is being removed from the air, the relative humidity is 100%, but as that water-saturated cool air is moved out into the larger area of the building and mixes with warmer air the relative humidity lowers, but the RH will still be unlikely to be as low as uncooled air outside the building. Kent Swafford
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