Founded in 1947, CALMAC Manufacturing Corporation is one of the world leaders in the product design and manufacture of off-peak cooling (OPC) systems, which utilize thermal energy storage (TES) to air condition buildings. In addition, it is one of the largest manufacturers of ice-skating rink equipment in the world. The company serves to an array of customers, such as The Durst Organization, Underwriters Laboratories, Kohls, JC Penney, DuPont, IBM, DaimlerChrysler, Wang, American Airlines, McDonalds Marriott Hotels, schools and universities, medical centers and ice rinks across the world.