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.
Cramerton, North Carolina
Cramer is credited with designing and equipping "about one-third of the new cotton mills in the South" between 1895 and 1915, and simultaneously acquiring extensive holdings in textile mills. Among Cramer's numerous industrial engineering patents was one for the "Cramer System of Air Conditioning", which included the automatic regulation of temperature and humidity. These early innovations in air conditioning resulted more from the need to remove lint from the air (a persistent problem in the textile mills) than to cool the factory atmosphere. The term "air conditioning" is attributed to Cramer.