The answer to how much air duct sealing costs is that it can vary widely depending on several factors. Typical ranges for professional air duct sealing can be anywhere from $500 to $2,000 or more, depending on the size of your home, the accessibility of the ductwork, and the extent of the sealing required.
The cost is influenced by factors like the number of vents and registers, the length and complexity of the ductwork, and whether any repairs or replacements are needed. Hiring a qualified HVAC technician to properly seal your air ducts is essential, as DIY methods are often ineffective and can even cause more problems. Getting multiple local quotes is the best way to determine the specific cost for your home.