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Loosely defined, a vapor barrier is a layer of material intended to prevent the absorption of moisture into construction. In this context, it's the use of plastic sheeting, waterproof tape, and insulation to properly seal a crawl space to prevent moisture, which, if left unchecked, can result in considerable damage to your home and its foundation.
Learn about air conditioner Freon and how to recharge your home AC by refilling the refrigerant. Freon is a refrigerant which helps your AC unit release cool air.