Over 1,700 companies have reserved more than 414,500 sq ft of exhibit space for the 2012 AHR Expo in Chicago January 23-25, making it the largest HVACR exposition of all-time. With several weeks remaining before the Show opens at McCormick Place, the 2012 event has already surpassed the previous all-time record of 410,415 sq ft set at the 2006 exposition in Chicago.