Young Supply, founded in 1935, is owned and run by the Vallan family. Young Supply is an old hand in the HVAC-supply business. The company has more than 15 locations in Michigan and Ohio that sell air-conditioning, ventilation, food-service, heating, and refrigeration equipment and components. Brands include Friedrich, Honeywell, Johnson Controls, and many others. Young also sells tools and measurement instruments along with controls and motors. Visitors to the company Web site can check inventory, apply for credit, and use the company's interactive area, energy to work, length, mass, and pressure HVAC conversion tables.