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Old 11-25-2012, 02:23 AM
dewalt18 dewalt18 is online now
 
Join Date: Nov 2009
Location: Calgary
Posts: 1,696
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The percentage is based on "relative humidity". I won't go into details, but basically it's the amount, in percentage, of moisture that air can hold at a certain temperature before becoming saturated. Cold air, being more dense, can hold less moisture than less dense warm air can. that's why watching the windows is key. As the air hits the window (the biggest heat loss point in a house), it cools rapidly causing it to become saturated, thus condensation. Even though you may feel more comfortable at this higher humidity, it is wise to back the humid off a bit as condensation can cause considerable damage to windows, casings, and even framing around them, and can even promote mold growth.
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