The total cost to professionally fix and seal leaky residential ductwork typically ranges from five hundred to two thousand dollars, depending on the total square footage of your home, the accessibility of the ducts in crawlspaces or attics, and the severity of the gaps. Simple sealing of accessible joints using mastic paste and foil tape in an open basement might cost on the lower end, whereas comprehensive aerodynamic aerosol sealing processes like Aeroseal applied throughout hidden walls and ceilings can cost between fifteen hundred and three thousand dollars. Investing in duct sealing usually pays for itself quickly through reduced monthly heating and cooling energy bills and improved home comfort. You can troubleshoot by requesting detailed estimates from licensed HVAC contractors. You can verify value when post-repair blower door testing proves dramatic leakage reduction.
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