Duct Leakage Cost Calculator

Estimate how much energy and money you lose each year from leaky ductwork, and how much you could save by sealing your ducts.

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How It Works

Duct leakage is one of the biggest hidden energy wasters in homes with forced-air HVAC systems. The average home loses 20 to 30 percent of its conditioned air through holes, cracks, and poorly connected joints in ductwork — especially ducts running through unconditioned spaces like attics, crawl spaces, and garages. That means your system works much harder than it should. The Department of Energy estimates that sealing and insulating ducts can improve efficiency by 20 percent or more. Professional duct sealing uses mastic or metal-backed tape (not cloth duct tape, which dries out). Aeroseal is a newer method that pressurizes the system and sprays sealant particles that collect at leak points. A duct blaster test can measure exactly how leaky your ducts are before and after sealing.