Founded in 1889, HOLADAY-PARKS INC. is one of the largest mechanical contractors in the United States. Located in Seattle, Wash., the firm offers full-service mechanical design/installation, energy services, building controls, plumbing/piping, service/maintenance, engineering and architectural metal. It possesses one of the largest full-service sheet metal shops in Fairbanks, Alaska. The metal shop specializes in HVAC (heating, ventilation and air conditioning) design and installation as well as custom sheet metal fabrication. HOLADAY-PARKS INC.'s list of partners includes The American Society of Heating, Refrigerating & Air-conditioning Engineers Inc., United States Green Building Council, Building Owners & Managers Association, The Building Commissioning Association, and many more.