The answer to 'air duct sealing or air duct sealing' is that air duct sealing is a process of sealing leaks and gaps in your home's ductwork to improve energy efficiency and indoor air quality. Duct sealing can be done either by a professional HVAC technician or as a DIY project, depending on the extent of the work required.
Professionally-done duct sealing typically involves using mastic sealant or specialized tapes to seal visible leaks and joints in the ductwork. This can help reduce energy loss from air leaks, improve airflow, and prevent dust and allergens from entering your home through the ductwork. DIY duct sealing, on the other hand, is often limited to using duct sealant tape on accessible areas of the ductwork.