Duct Sealing is often the most cost effective way to improve the efficiency and comfort of your home. Ducting is also responsible for large swings in the air pressure of the interior. These swings have can have a very negative affect on air leakage rates and combustion appliances. Finally a duct seal will help indoor air quality. Leaky return ducts can pull pollutants into your home from your attic, crawl space, basement or garage.