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Home   Articles   Air Duct Sealing DIY | How To Air Seal HVAC Ducts

Air Duct Sealing DIY | How To Air Seal HVAC Ducts

Your air ducts are one of the most important systems in your home, and if the ducts are poorly sealed or insulated they are likely contributing to higher energy bills.

Your home’s duct system is designed to carry conditioned air from your home’s furnace and central air conditioner to each room. Ducts are typically made of sheet metal, fiberglass, or other materials which tend to leak air at the connections.

Ducts that leak heated air into unheated spaces can add hundreds of dollars a year to your heating and cooling bills. Air sealing and insulating ducts in unconditioned spaces is usually very cost-effective and recommended by building codes in most areas.

Sealing your ducts to prevent leaks is even more important if the ducts are located in an unconditioned area such as an attic, crawl space or unfinished basement. If the supply ducts are leaking, heated or cooled air can be forced out of unsealed joints and lost. In addition, unconditioned air can be drawn into return ducts through unsealed joints. When this air is brought into your ducts, it may cause poor indoor air quality.

Although minor duct repairs are easy to make, qualified professionals should seal and insulate ducts in unconditioned spaces to ensure the use of appropriate sealing materials.

Michael Church, Crawl Space Ninja, Basement Waterproofing Knoxville TN
Indoor Air Quality Specialists, Inc. is an Angie’s List Super Service Award Winner 3-years running. Learn more at:

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