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.
Nash Motors
Using its Kelvinator refrigeration experience, the automobile industry's first single-unit heating and air conditioning system was introduced by Nash in 1954. This was a compact, affordable system for the mass market with controls on the dash and an electric clutch. Entirely incorporated within the engine bay, the combined heating and cooling system had cold air for passengers enter through dash-mounted vents. Competing systems used a separate heating system and an engine-mounted compressor with an Evaporator in the car's trunk to deliver cold air through the rear package shelf and overhead vents. The alternative layout pioneered by Nash "became established practice and continues to form the basis of the modern and more sophisticated automatic climate control systems."