Air Duct Sealing

Seal your heating and cooling ducts

Ducts that move air to-and-from a forced air furnace, central air conditioner, or heat pump are often big energy wasters. Sealing and insulating ducts can improve the efficiency of your heating and cooling system by as much as 20 percent — and sometimes much more.

How do you know that your home has poorly performing ducts?

• you have high summer and winter utility bills;
• you have rooms that are difficult to heat and cool;
• you have stuffy rooms that never seem to feel comfortable;
• your ducts are located in an attic, crawlspace, or the garage;
• you find tangled or kinked flexible ducts in your system.

Focus first on sealing ducts that run through the attic, crawlspace, unheated basement, or garage. Use duct sealant (mastic) or metal-backed (foil) tape to seal the seams and connections of ducts. After sealing the ducts in those spaces, wrap them in insulation to keep them from getting hot in the summer or cold in the winter. Next, look to seal any other ducts that you can access in the heated or cooled part of the house.

See our Duct Sealing brochure (1.13MB) for more information. for more information.