The answer to 'how much to replace duct cleaning' is that the cost can vary widely depending on several factors. Generally, duct cleaning for an average-sized home typically ranges from $300 to $700. The exact price will depend on the size of your home, the extent of the cleaning needed, the number of vents and ducts, and your location.
Factors that can influence the cost include the accessibility of the ducts, the presence of any obstructions or damage, and whether you need additional services like duct sealing or repair. It's best to get quotes from multiple local HVAC contractors to compare prices and services. They can assess your specific needs and provide an accurate estimate for your home.