The answer to 'how much does air duct cleaning cost' is that the cost can vary widely depending on several factors. Most professional air duct cleaning services typically range from $300 to $700 for an average-sized home, but the actual price will depend on the size of your home, the number of vents and ducts, the level of contamination, and your location.
Factors that can influence the cost include the accessibility of the ductwork, the need for any repairs or modifications, and whether you require additional services like sanitizing or mold remediation. It's important to get quotes from multiple local providers to compare prices and services.