The answer to 'how much does air duct cost' is that the cost of air duct cleaning can vary significantly depending on a few key factors. In general, air duct cleaning for a typical home can range anywhere from $300 to $1,000 or more. The specific cost will depend on the size of your home, the complexity of your ductwork, the number of vents and registers, and the level of cleaning required.
Other factors that can influence the cost include the location of your home, the experience and reputation of the cleaning company, and whether you need any additional services like mold remediation or duct sealing. It's important to get quotes from multiple local air duct cleaning companies to compare pricing and services.