You can't believe how much humidity can migrate into cold ductwork and condense? Lets me count the ways, Heat rises and moves to cold, humidity migrates to a drier location, les saturated. The ductwork may get down to as close as 15 degrees of the outside temperature, or more, in the winter i.e.. 5 degrees outside, 20 degrees in attic. Cooking, showers and humidifiers of course, add to this problem. I have seen flex ductwork get so heavy it fell through the drywall. It is a real problem. The last case I stated, the solution was. To remove and replace all the duckwork. While we where there we installed a safety drain pan and brought the installion up to code. Provided the homeowner with magnetic sheets for the supplies and a ductboard winter block, for the cold air return. At least 5 years later never a complain, we got a very nice letter about here heating cost being significantly better from the previous 2 years she lived there.
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