The answer to 'how much to fix air conditioner in Chicago' is that the cost can vary significantly depending on several factors. Generally, the typical range for air conditioner repair in the Chicago area is between $150 to $600, though some more complex issues could cost more.
The exact cost will depend on the specific problem with your AC unit, the parts and labor required, the age and model of your system, and the reputation and expertise of the HVAC contractor. Routine maintenance and minor repairs like replacing a thermostat or cleaning the coils are typically on the lower end of that range, while major issues like compressor or refrigerant leaks can be more expensive.