The answer to 'how much to replace thermostat in Illinois' is that the cost to replace a thermostat can vary significantly depending on several factors. Generally, the typical range for a basic thermostat replacement can be anywhere from $100 to $300, including both the cost of the thermostat unit and the labor to install it.
The actual price will depend on the type of thermostat, the complexity of the installation, and whether any additional HVAC system modifications are required. Higher-end, smart or programmable thermostats will be on the higher end of the range, while basic manual models will be on the lower end. The cost can also be influenced by the accessibility of the existing thermostat, the age and condition of the HVAC system, and the rates charged by the local HVAC contractor. Getting multiple quotes from licensed and experienced HVAC professionals in your local area is essential to determine the most accurate and competitive pricing.