The answer to 'how much to replace central air in Illinois' is that the cost to replace a central air conditioning system can vary significantly based on several factors. Generally, homeowners in Illinois can expect to pay between $4,000 to $12,000 or more to replace a central air unit, depending on the size of the home, the efficiency of the new system, and other considerations.
Some key factors that influence the cost of a central air replacement include the size of the home (square footage), the SEER rating (energy efficiency) of the new unit, the complexity of the installation, and whether any ductwork or other components need to be replaced. Homes with larger square footage or that require more complex installations will be on the higher end of the cost range.