The answer to 'how much to fix HVAC system in Chicago' is that the cost can vary widely depending on several factors. Typically, HVAC repair costs in the Chicago area range from a few hundred dollars for minor fixes up to $2,000 or more for more extensive work. The exact price will depend on the specific issue, the age and complexity of your HVAC system, the parts and labor required, and the reputation and pricing of the local HVAC contractor you hire.
Some common factors that influence HVAC repair costs in Chicago include the type of system (furnace, air conditioner, heat pump, etc.), the extent of the repair needed, whether any parts need replacement, and the hourly labor rates in your local area. It's best to get multiple quotes from reputable HVAC companies to get an accurate estimate for your specific situation.