Most homeowners can install their air duct insulation. Generally, you will not need insulation for heating and air - conditioning ducts that are enclosed in already well- insulated portions of your house. Use a utility knife to cut foil-faced fiberglass insulation to the proper size. Wrap the insulation around the duct, and then pinch the seam closed.
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InspectAPedia tolerates no conflicts of interest. You can buy duct insulation in two different types. The first is regular fiberglass insulation combined with a foil backing. It also comes as a sheet of polyethylene.