Korte installed an Infinity 96 gas furnace and Aprilaire humidifier four years ago to reduce my heating and cooling expenses. Twice in the past four years my furnace and air conditioner went out. I called and they came the next day to fix it. The servicemen are very efficient, courteous, and knowledgeable. I am satisfied with their professional work to get my furnace fixed. Last year Korte wired my attic fan and it took only thirty minutes.