As the longest-tenured York dealer in the world, M.S. Johnston Co. excels at building and sustaining relationships. We value each association with customers, suppliers and professional groups. Along with the companys beginnings in commercial refrigeration, we have expanded to include the food service industry, heating and air conditioning and mechanical engineering. We offer sheet metal, commercial, and industrial HVAC design/build, along with service and sales of restaurant and HVACR equipment.