This paper addresses the history of the international air-conditioning, heating, and refrigerating expositions held in the United States from the first International Exposition of Refrigeration, held September 17 to October 1, 1913, to the most recent International Air-Conditioning, Heating, and Refrigeration expositions held annually and cosponsored by the Air- Conditioning and Refrigeration Institute (ARI) and the American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc. (ASHRAE). Emphasis is given in the paper to the exhibits of the earliest expositions and to the evolution and maturation of the expositions as the technology advanced.

KEYWORDS: USA, air conditioning, heating, refrigeration, exhibits, exhibition spaces.