answers: 1902
context: Dutch inventor Cornelis Drebbel demonstrated "Turning Summer into Winter" as an early form of modern air conditioning for James I of England by adding salt to water. Modern air conditioning emerged from advances in chemistry during the 19th century, and the first large-scale electrical air conditioning was invented and used in 1902 by US inventor Willis Carrier. The introduction of residential air conditioning in the 1920s helped enable the great migration to the Sun Belt in the United States. In 1758, Benjamin Franklin and John Hadley, a chemistry professor at Cambridge University, conducted an experiment to explore the principle of </s> are installed in an open window. The interior air is cooled as a fan blows it over the evaporator. On the exterior the heat drawn from the interior is dissipated into the environment as a second fan blows outside air over the condenser. A large house or building may have several such units, allowing each room to be cooled separately. In 1971, General Electric introduced a popular portable in-window air conditioner designed for convenience and portability. Packaged terminal air conditioner (PTAC) systems are also known as wall-split air conditioning systems. They are ductless systems. PTACs, which are frequently used in </s> and hotels, where they are supposed to reduce water consumption (however, some evidence to the contrary has been published) and reduce the transmission of disease causing microbes. They can also be found in some kitchens and in the washrooms of some private residences. Other uses include providing drinking water to pets or livestock, whereby the presence of an animal allows water to flow into a watering trough or dish. Automatic faucets were first developed in the 1950s but were not produced for commercial use until the late 1980s when they first appeared to the general public at airport lavatories. They
question: when did the first air conditioner come out