The answer to 'how much to replace furnace repair in Illinois' is that the cost to replace a furnace can vary significantly depending on several factors. In general, homeowners in Illinois can expect to pay anywhere from $2,000 to $8,000 or more for a full furnace replacement, including the cost of the unit, labor, and any necessary ductwork modifications.
The exact price will depend on the size of your home, the type and efficiency of the new furnace, the complexity of the installation, and your location within Illinois. Older homes or those requiring extensive ductwork changes may be on the higher end of the range. It's important to get quotes from multiple licensed HVAC contractors in your local area to get the best price for your specific needs.