Founded in 1909, M.S. Johnston Company is a provider of commercial refrigeration and heating and air conditioning services. Its heating, ventilation and air conditioning division offers commercial, industrial and institutional design and installation services. The division serves shopping centers, manufacturing firms, computer centers, nursing homes, schools, churches, government buildings and office complexes. M.S. Johnston Company has a sheet metal shop that provides ductwork fabrication. Its refrigeration department designs, sells and installs commercial refrigeration equipment, including reach-in freezers and refrigerators, ice makers and dispensers, walk-in freezers and walk-in coolers. The department also provides services for blast chillers, specialty metal and hardware freezers, fruit and vegetable storage, liquid cooling systems for food, plastic extrusion and heat reclaim systems. M.S. Johnston Company designs, installs and distributes food service equipment for restaurants, casinos, hospitals, cafeterias, nursing homes and refrigerated warehouses. Its affiliations include Associated Builders and Contractors, National Federation of Independent Businesses, American Society of Heating, Supermarket Equipment Incorporated and Washington County Chamber of Commerce. M.S. Johnston Company is located in Hagerstown, Md.