A Windsor based company called Harold's Heating opened a shop in Chatham in 1966. The company continued to operate until 1973 at which point the Chatham branch became independent and the name was changed to Hercon Sheet Metal. The current owners Tom Hoffman and Rob Hoffman bought the business in 1999 and continued to work out of the original shop on Longwoods Road. In 2003 Hercon moved into a new 9,000 square foot fabrication shop located on Siemens Drive in Chatham. This move has allowed Hercon to upgrade their fabrication equipment to some of the best in the area.