The answer to 'how much to replace central air in Illinois' is that the cost to replace a central air conditioning system can vary widely depending on several factors. Typical ranges for a full central air conditioner replacement in Illinois tend to fall between $4,000 to $12,000, though costs can be higher or lower depending on the specific situation.
Some of the key factors that influence the cost include the size of your home, the efficiency rating of the new system, the complexity of the installation, and any necessary repairs or upgrades to your home's ductwork. It's important to get quotes from multiple local HVAC contractors to understand the pricing in your specific area.