The answer to 'how much to replace AC in Illinois' is that the cost to replace an air conditioning unit in Illinois can vary widely depending on several factors. Typical ranges for a full AC replacement can be anywhere from $3,000 to $10,000 or more, depending on the size of your home, the efficiency of the new unit, and the complexity of the installation.
Some key factors that influence the cost include the tonnage (size) of the AC unit, the SEER (efficiency) rating, the type of system (central air vs. ductless mini-split), and any necessary ductwork modifications. Labor costs, which can make up 30-50% of the total, also vary based on your location within Illinois and the complexity of the installation. It's essential to get multiple quotes from local HVAC contractors to understand the specific costs for your home.