The answer to 'how much to fix tune-up in Illinois' is that the cost can vary significantly depending on several factors. As a general range, a typical HVAC tune-up in Illinois can cost between $75 to $200 for a standard residential system.
The exact price will depend on the age and complexity of your HVAC system, the parts and labor required, the reputation and rates of the local HVAC contractor, and your location within Illinois. Larger or more complex systems, or those that require more extensive maintenance, may be on the higher end of this range. It's best to get quotes from multiple local HVAC companies to find the most competitive price for your specific needs.