The answer to 'how much does it cost to replace a furnace in Illinois' is that the cost can vary significantly depending on several factors. In general, the typical range for a full furnace replacement in Illinois is between $3,000 to $8,000, with the average cost being around $5,000.
The main factors that influence the cost include the size of your home, the efficiency rating of the new furnace, the complexity of the installation, and whether any ductwork or other components need to be replaced. Additionally, labor costs can vary depending on your location within Illinois and the contractor you hire. It's essential to get multiple quotes from licensed HVAC professionals in your local area to get the best price.