Gleason and Elfering Heating and Air Conditioning is a major provider of HVAC services in the Wauconda area. You can always count on our technicians to provide upfront estimates, expert diagnosis, and prompt service. To ensure your satisfaction, we offer guarantees and vow to get things right the first time. To get an estimate on your furnace or AC repair, give us a call. Gleason and Elfering works with all major HVAC brands. Our service area includes Vernon Hills, Island Lake, and Mundelein.