The answer to 'how much to replace air duct sealing in Chicago' is that the cost can vary significantly depending on several factors. In general, you can expect to pay anywhere from $500 to $2,000 or more to have your air ducts properly sealed by a professional HVAC technician in the Chicago area.
The exact cost will depend on the size of your home, the accessibility and condition of the ductwork, the materials needed, and the labor required. Older homes or those with hard-to-reach ducts may cost more. Additionally, the experience and expertise of the HVAC contractor can impact the final price.