The answer to 'how much to replace furnace in Illinois' is that the cost to replace a furnace can vary significantly depending on several factors. Generally, 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 and efficiency of the new furnace, the complexity of the installation, and any necessary ductwork or electrical work. Furnaces with higher energy efficiency ratings tend to cost more upfront but can save you money on utility bills in the long run. Additionally, the age and condition of your existing furnace, as well as your home's layout and accessibility, can all impact the final price.