Ahr Expo 2025 Chicago Exhibitors List. The ahr expo, spanning an expansive 527,000 net square feet of exhibit space at mccormick place, played host to more than 1,860 exhibitors, including 344 international. The ahr expo, short for air conditioning, heating, and refrigeration exposition, is a leading international trade fair in the field of air conditioning, heating, and refrigeration technology.
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