Delwood Supply Company was founded in 1963 by Joseph Fisher Jr. and Ralph Long in Royal Oak, Michigan. A short time later Walter Denna Joined the company, bringing a knowledge of heating systems. In 1974 Mark W. Fisher started his career with the company and today is President of the corporation. Delwood Supply Co. opened a second location in 1994 in Livonia, Michigan and is managed by Don Lyon, Vice President.