The answer to 'how much to fix thermostat in Illinois' is that the cost can vary widely depending on several factors. In general, the typical range for thermostat repair or replacement in Illinois is between $100 to $300. The exact price will depend on the type of thermostat, the complexity of the repair, and the labor rates in your local area.
Factors that can influence the cost include the age and model of the thermostat, whether it needs to be repaired or replaced entirely, and the difficulty of accessing and working on the HVAC system. Older, manual thermostats are usually less expensive to fix than modern, programmable models. Additionally, the cost may be higher if the issue requires more extensive work, such as replacing wiring or other components.