The answer to 'how much to replace air conditioner in Illinois' is that the cost can vary widely depending on several factors. Typical ranges for a full air conditioner replacement in Illinois are usually between $3,000 to $7,000, but the exact price will depend on the size and efficiency of the new unit, the complexity of the installation, and your local market conditions.
Factors that can influence the cost include the tonnage (cooling capacity) needed for your home, whether you need to upgrade the electrical or ductwork, and the brand and model of the new AC unit. Prices also vary by location within Illinois due to differences in labor rates and material costs. It's essential to get multiple quotes from licensed HVAC contractors in your local area to find the best value.