The answer to 'how much to fix heat exchanger in Chicago' is that the cost to repair or replace a heat exchanger can vary significantly depending on several factors. In general, you can expect to pay anywhere from $500 to $2,500 or more to fix a heat exchanger, with the average cost being around $1,000 to $1,500.
The exact cost will depend on the make and model of your HVAC system, the extent of the damage, the labor rates in your local area, and whether you need a partial or full heat exchanger replacement. It's important to get quotes from multiple licensed HVAC contractors in your area to get the best price.