It is 43 outside now and our window frames are cold but there is no condensate. The dewpoint is low enough now for condensate not to form. The other night, we had a fair amount of condensate but the dewpoint in the house was higher. Condensate only forms when the metal frames have cooled to the dewpoint (which is a measure of the absolute amount of moisture in the air). Lack of adequate ventilation in a house can result in higher dewpoints as moisture can accumulate from showers, cooking, breathing etc. Most homes have enough ventilation that moisture content in the air will adjust to the what is in the outside air relatively quickly. The problems is worse when it has been relatively warm outside and all of a sudden we have a big temperature drop - the air inside the house will have a relatively high amount of moisture and it will then condense on the cold frames.
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Originally Posted by herbaru
I wish this was true. Our windows are covered with plantation shutters and they have condensation every cold night. We are into our second winter in our just over a year old home. The windows hit by the sun dry up but the ones not hit till late in the day do not dry. Today I noticed mold forming!
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