Is sealing air ducts a good idea?

Sealing your home's residential heating and cooling ductwork is universally considered an exceptionally good idea and one of the most cost-effective home improvements you can make. In a typical house, twenty to thirty percent of the conditioned air produced by your HVAC unit escapes through unsealed joints, gaps, and disconnected boots before reaching your living areas, forcing your system to run longer and work harder. Sealing these leaks eliminates hot and cold spots room-by-room, reduces dust and allergens pulled from unconditioned attics or crawlspaces, and extends equipment lifespan. You can troubleshoot high energy bills with a professional duct blower door test. You can verify the value of the investment when post-sealing energy bills drop significantly and room temperatures remain balanced and comfortable.