1880, American Shule first installed the blade directly on the motor, and then connected to the power supply. The blades turned rapidly, and a cool breeze came head on. This is the first electric fan in the world.
Willis Haviland Carrier, an American inventor known as the father of refrigeration, designed and installed the first air conditioning system in 1902. The air conditioning system was designed for a printer in new york, USA. He found that the change of temperature would cause the deformation of paper, which would lead to the imbalance of color ink. Carrier registered the patent 1906.