The answer to 'how much does installation cost in Illinois' is that the cost of HVAC installation can vary widely depending on several factors. In general, you can expect to pay anywhere from $3,000 to $10,000 or more for a full HVAC system installation in Illinois. The exact cost will depend on the size of your home, the type of HVAC system, the complexity of the installation, and your location within the state.
Factors that can influence the cost include the brand and efficiency of the equipment, the need for ductwork modifications, the accessibility of the installation site, and any necessary electrical or structural work. It's important to get quotes from multiple licensed HVAC contractors in your local area to get the best estimate for your specific project.