Jennings-Dill was established in 1947 by John W. Jennings and Roy J. Dill, Sr. The company, first called Super Supply Company, initially provided commercial air conditioning equipment, refrigeration services, and ice machines to the Greenville area. In 1963, recognizing the demand for qualified Mechanical Contractors in the growing commercial and industrial markets of the Southeast, the company changed it's name to Jennings-Dill, Inc.