The answer to 'how much does duct cleaning cost in Illinois' is that the cost can vary significantly depending on several factors. Typically, duct cleaning in Illinois can range from $300 to $800 or more for an average-sized home. The exact cost will depend on the size of your home, the number of vents and ducts, the level of contamination, and the accessibility of the ductwork.
Factors that can influence the cost include the type of cleaning method used (truck-mounted or portable), the experience and reputation of the HVAC contractor, any necessary repairs or replacements, and whether you need additional services like sanitizing or sealing the ducts. It's important to get quotes from multiple local HVAC companies to compare prices and find the best value for your home.