Air sealing isn’t duct sealing. And it isn’t insulation. It’s the process of controlling the flow of air by sealing off openings in the house, such as gaps and cracks, so that bad particles stay outside and the desired temperature stays inside. And it’s something more HVAC contractors should consider adding to their menu of offerings.
Duct sealing controls the flow of air within the duct system. Some types of insulation, such as spray foam and foam board, also control airflow — at least, to some extent. Air sealing, however, is about making sure the building enclosure controls the flow of air, said Allison Bailes, founder and CEO of Energy Vanguard.