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CALMAC Manufacturing Corporation is the world leader in the product design and manufacture of Off-Peak Cooling (OPC) systems, which utilize Thermal Energy Storage (TES) to air condition buildings. Calvin D. MacCracken, in Englewood, New Jersey, founded CALMAC in 1947. Just minutes from New York City, the company's New Jersey manufacturing facility produces over 3,000 IceBank® Storage tanks annually.