Timeline of United States inventions (1890–1945)
Air conditioning is the cooling and de-humidification of indoor air for thermal comfort. Using a system of coils as a solution to cool and remove moisture from muggy air in a printing plant that was wrinkling magazine pages, Willis Carrier invented and manufactured the world's first mechanical air conditioning unit in 1902. Carrier's invention – encompassing the first system to provide man-made control over temperature, humidity, ventilation and air quality, was first installed as a solution to the quality problems experienced at a Brooklyn printing plant, Sackett-Wilhelms Lithographing and Publishing Company. Air conditioning not only spawned a company and an industry, but also brought about profound economic, social and cultural changes.
Apalachicola, Florida
In 1849, Apalachicola physician Dr. John Gorrie discovered the cold-air process of refrigeration and patented an ice machine in 1850. He had experimented to find ways to lower the body temperature of fever patients. His patent laid the groundwork for development of modern refrigeration and air conditioning, making Florida and the South more livable year round. The city has a monument to him, and a replica of his ice machine is on display in the John Gorrie Museum. The John Gorrie Memorial Bridge, originally built in 1935 and rebuilt in 1988, carries U.S. 98 across Apalachicola Bay to Eastpoint.