The answer to 'how much does central air cost in Illinois' is that the cost of installing a new central air conditioning system in Illinois can vary widely depending on several factors. Typically, the cost range for a central AC system in Illinois is between $3,000 to $12,000 or more, with the average being around $5,000 to $7,000.
The main factors that influence the cost include the size of your home, the efficiency rating of the system, the complexity of the installation, and whether any ductwork needs to be added or modified. Homes with existing ductwork will generally have lower installation costs than those that require new ductwork. Additionally, the cost can vary based on your location within Illinois, as labor and material costs may differ between regions.