Ductwork sealing with Aeroseal is a process that uses an injection polymer glue that is aerosolized in the duct system, sealing the ductwork from the inside. A manual seal still needs to be to complete the ductwork sealing process but Aeroseal is an effective method at closing all the gaps and holes in the ductwork. The Department of Energy and SRP estimate at least 20% of the air in the ductwork is lost from duct leaks.
Aeroseal may not be the best option for sealing the ductwork for your home. Ductwork replacement may be a better option is your home was built in the 1970's - 1980's. Here is a guide and Frequently Asked Questions about Aeroseal to help you make an informed decision.