The answer to 'how much to replace central air in Chicago' is that the cost to replace a central air conditioning system in Chicago can vary widely depending on several factors. In general, a full central air replacement in the Chicago area typically ranges from $4,000 to $12,000 or more, with the average cost being around $7,000 to $9,000.
The exact cost will depend on the size of your home, the efficiency rating of the new system, the complexity of the installation, and whether any ductwork or electrical work is needed. Older homes may require more extensive modifications, which can increase the overall project cost. Additionally, the brand, model, and features of the new AC unit you select will impact the final price.