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.
Alice H. Parker
Alice H. Parker (b. 1895) was an African American inventor known for her contribution to the heating furnace. She invented a furnace that supplied central heating for entire homes and buildings, which was patented on December 23, 1919. This was much safer than burning firewood. Her heating furnace was different from the other furnaces around at that time. Her design had air ducts that allowed heat to spread throughout the structure. Parker's invention included a multiple burner system and used natural gas. What made it especially unique is that it was like later zone heating, where the temperature could be moderated in different areas of a building. Parker was born in Morristown, New Jersey. She attended Howard University Academy, a high school located in Washington D.C., and was granted a certificate with honors in 1910.