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747
2nd Century
747 AD- Ding Huan, of the Han Dynasty, invented the rotary fan. Han ordered slaves to propel the fan blades. www.energy.gov/articles/history-air-conditioning -
907
Ancient Rome
907 AD- Used water from the aqueducts to circulate through the walls of homes to cool them. www.en.wikepedia.com -
Ben Franklin's Contribution to A/C
1758- Ben Franklin and John Hadley conducted an experiment in evaporation, for cooling of structures. www.griffithenergyservices.com -
Mike Faraday
1820- English Scientist, Mike Faraday, discovered that by compressing and liquefying ammonia, the air could be chilled. www.famousscientists.org -
Carrier Brand
1902- Willis Carrier invented electrical air conditioning. He did this after graduating from college. Carrier was working for a blacksmithing company when he began to work on a project for a lithographing company. The heat and humidity was causing the paper they worked with to become damp, and roll up at its edges. People did not want to purchase their products because of this.
www.slate.com/articles/air-conditioning -
Invent of Freon
1928- The coolant, Freon, was developed by the Dupont Corporation. www.learn.compactappliance.com -
Freon is Banned
1992- For many years leading up to 1992, scientists were fearful about the affects Freon was having on the atmosphere. West Germany and other nations determined that the chemical, Freon, was hazardous to the Ozone and decided to ban its continued use. www.energy.gov/articles/history-air-conditioning -
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Protecting the Ozone
Beginning in 1992, scientists around the world worked to invent a coolant that would be more environmentally friendly. The scientists were influenced by global policies and politics that would often work against their efforts to develop a product that would be eventually viewed as safer for the world's environment over the old Freon product. www.popularmechanics.com/air-conditioning -
EPA Approves
2011- The Environmental Protection Agency agreed that the ozone safe coolant could now be made in the United States. Up until then, the United States had to rely on other countries to make the product for use in the United States. www.hvac.com