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The keys are duct leakage, R-values, and the vapor barrier
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Water vapor from the air condenses on air conditioning ducts in humid climates. It's as normal as poorly insulated bonus rooms making occupants uncomfortable or cigarettes causing lung cancer†. Condensation on ducts is most common in crawl spaces and basements, where the air is more likely to have a higher dew point.
from Building Science http://www.greenbuildingadvisor.com/articles/dept/building-science/buried-ducts-allowed-2018-energy-code
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