David N. Crosthwait (1898 – 1976) – Heating systems
David N. Crosthwait was an accomplished inventor with air conditioning and heat transfer expertise. Throughout his career, Crosthwait secured an impressive 119 patents, with 39 of them in the United States. He gained a reputation by the 1930s because of his numerous inventions, including a boiler, vacuum pump, and thermostat control. His most highly-respected accomplishments include his heating system design for New York’s iconic Radio City Music Hall and the Rockefeller Center. Crosthwait’s contributions to heating, ventilation, and air conditioning (HVAC) continue to inspire and inform new generations of inventors and engineers.