When it comes to where you build a fire inside your house, don't mess around. Go with the best. The thing with Illinois is there isn't any regulation/required certification for fireplace companies. They can say they are certified by the county or whate ver but that really doesn't mean much. They are not even required to go for continued education. My home inspector recommended this company to me and they truly are excellent and know what they are doing. Members of the NCSG and certified by the CSIA. Kingsborough Chimney Service – 847-639-9993http://kbchimney.com/