The answer to 'how much to replace air conditioner in Chicago' is that the cost can vary widely depending on several factors. Typically, the cost to replace a central air conditioning unit in the Chicago area can range from $3,000 to $7,000 or more. The exact price will depend on the size of your home, the efficiency rating of the new unit, the complexity of the installation, and whether any additional ductwork or electrical work is required.
It's important to get quotes from multiple HVAC contractors in your local area, as pricing can vary significantly between companies. Be sure to compare apples-to-apples when reviewing quotes, and ask about any additional fees or costs that may be included.