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.
Robert Stirling
Robert Stirling's best known invention is the heat engine now referred to as the Stirling Engine. In 1816 Robert Stirling and his younger brother, James Stirling, applied for a patent in both Scotland and England for a device they invented, a Heat Economiser. The function of this invention was to store and release heat as air circulated through its mechanisms. This differed from most heat engines which used steam as their method of storing and releasing energy.