The answer to 'how much to replace air filter in Illinois' is that the cost can vary significantly depending on several factors. As a general range, you can expect to pay between $10 to $50 to replace a standard air filter in your home in Illinois.
The specific cost will depend on the size and type of filter needed for your HVAC system, as well as whether you do it yourself or hire a professional HVAC technician. Larger or specialty filters, or those that require more complex installation, will be on the higher end of that range. Additionally, labor costs for a professional to replace the filter can add $50 or more to the total.