The answer to 'how much to replace duct cleaning in Illinois' is that the cost can vary significantly depending on several factors. Typical duct cleaning costs in Illinois can range from $300 to $700 or more, but the actual price will depend on the size of your home, the number of vents and ducts, the level of cleaning required, and the experience and reputation of the HVAC contractor.
Factors that can influence the cost include the accessibility of the ductwork, the presence of any mold or debris buildup, and whether any duct repairs or replacements are needed. It's important to get quotes from multiple local HVAC companies to compare prices and services. Be wary of unusually low estimates, as they may indicate lower-quality work.