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Condensation occurs when moisture-laden warm air strikes a cold, dry surface, such as a basement wall or window. A similar thing happens with cold water passing through copper pipes. Fortunately, minor condensation issues can be reduced substantially with a few inexpensive precautions. Difficulty: Easy.
If the air outside the ducts is humid enough, condensation will form on the ducts. The colder the air in the ducts and the more humid the air around the ducts, the more chance of forming condensation. Note that sweating ducts has nothing to do with moisture in the air inside the ducts.