Air conditioning
In 1902, the first modern electrical air conditioning unit was invented by Willis Carrier in Buffalo, New York. After graduating from Cornell University, Carrier found a job at the Buffalo Forge Company. There, he began experimenting with air conditioning as a way to solve an application problem for the Sackett-Wilhelms Lithographing and Publishing Company in Brooklyn, New York. The first air conditioner, designed and built in Buffalo by Carrier, began working on 17 July 1902.
Guillaume Amontons
Guillaume Amontons is also the inventor of the hot air engine. In 1699 he built his first engine, means over one century before the well-known Stirling Engine. This engine, named by Amontons "FIre Mill" was following a new thermodynamic cycle, that later became the Stirling cycle.