We use dew point to our benefit with dehumidifiers, which run humid air over a cold coil, condensing out a good deal of water vapor. When we're talking about parts of a building, though, we'd rather not have water vapor condensing on (or absorbing/adsorbing in) materials, whether they are bathroom windows, crawlspace band joists, or vinyl-covered walls. Accidental dehumidification is generally not a good thing. Here are two rules from avoiding the damage it can cause.
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