The answer to 'how much to fix furnace in Chicago' is that the cost to repair a furnace can vary significantly depending on several factors. Typical furnace repair costs in the Chicago area can range from $150 to $800 or more, depending on the specific issue, the age and type of furnace, and the complexity of the repair.
Some key factors that influence the cost include the parts needed (e.g. a simple thermostat replacement vs. a major component like the heat exchanger), the labor time required, and whether any additional system maintenance or cleaning is needed. The cost will also depend on the HVAC contractor you choose and their hourly service rates in your local Chicago market.