With the ever-increasing popularity of putting the air conditioning ducts outside the conditioned space; many contractors and homeowners in humid climates are now experiencing sweating ducts. Most of these sweating ducts are carrying cool supply air, although sometimes return air ducts can sweat, especially if the house is kept very cold and the return ducts run through cool vented crawlspaces. Ducts sweat because the outside surfaces of the ducts are below the dew point of the air in ...

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