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.
Christian Steenstrup
Christian Steenstrup (December 2, 1873 – November 28, 1955) was a Danish inventor who invented the hermetically sealed refrigeration unit while Chief Engineer at General Electric, and held over 100 patents.
His improvement to the refrigerator sent the sales of the G.E. Monitor Top refrigerator soaring.
Streenstrup immigrated to the US in 1894.