The old saying is that those who can, do, and those who can’t, teach. In the hvacr field, though, teachers regularly do the work as well as teach it. And sometimes they are inventors as well.
In 1996, John Williams Jr. and Fred R. Burgess were both hvacr instructors at CHI Institute in Southampton, PA. Burgess also owned a contracting company. The two were out doing a job for a plastics manufacturing company that had taken over a process plant and needed to convert it from steam to a hot water boiler.