Seal and Insulate Forced-Air Ductwork

For those of you with conventional central AC systems, the network of supply and return ducts is critical to cooling efficiently and effectively. Air leaks in the many fittings, seams and joints in the ductwork can lead to serious energy loss. According to Cary Weiner, the Clean Energy Specialist at Colorado State University Extension, “You can lose up to 30 percent of your cooled air in ductwork. So one of the most important pieces is sealing and insulating your ductwork inside the house.”

Conditioned air leaking from ducts often never makes it to your living spaces; it ends up in the basement, inside walls, under floors and other places where it’s essentially wasted. When ducts run through a hot attic or exterior wall, you need duct insulation to keep the air cool as it travels through.