Professional sealing of leaky residential ductwork typically ranges in cost from five hundred to two thousand five hundred dollars, depending heavily on the size of your home, the linear footage of the duct system, and the chosen sealing method. Traditional manual sealing using high-grade mastic paste and foil tape on accessible basement or crawlspace ducts generally costs between five hundred and twelve hundred dollars. In contrast, advanced technological solutions like automated interior aerosol sealant injection can cost between fifteen hundred and three thousand dollars, but they successfully seal inaccessible ducts hidden behind walls and ceilings. You can evaluate cost-effectiveness by comparing contractor bids against potential energy savings. You can verify proper project execution when post-sealing diagnostic blower door tests confirm that duct leakage has been reduced below acceptable regulatory thresholds.
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