The answer to 'how much to fix preventive maintenance in Chicago' is that the cost can vary widely depending on the size and type of your HVAC system, the specific maintenance services needed, and the rates charged by local HVAC contractors. As a general guideline, annual preventive maintenance for a typical residential HVAC system in Chicago can range from $100 to $300 or more.
Factors that can influence the cost include the age and condition of your equipment, the accessibility of components that need servicing, the level of cleaning and tune-up work required, and whether any repairs or part replacements are needed. It's best to get quotes from multiple local HVAC companies to compare prices and services.