Is it time to schedule furnace maintenance for your Mokena, IL, home? The cold season can be quite uncomfortable in this part of the country, especially if you have an inefficient heating system. Since your heating system must run for an extended period during the cold season, it is essential to ensure that it is well-maintained. Typically, heating maintenance should be scheduled annually. Getting regular heating tune-ups will ensure that your furnace is ready to keep you warm when winter arrives.