What type of insulation should be used for air conditioning ducts?

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Related Articles. Choose a faced fiberglass insulation to act as a moisture barrier on your air conditioning ducts. The U.S. Department of Energy recommends insulating ducts with insulation rated at R-6 or higher. Standard unfaced insulation has an R-value ranging from 2 to 4, so take the time to find a faced product with the appropriate R-value.

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