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 Willis Carrier.
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central air conditioning is invented in 1902. You can read the history of it and find out more information about air conditioning at en.wikipedia.org/wiki/Air_conditioning
1911
It was not discovered, it was invented.
1951
Air conditioning techniques were used in Ancient Egypt, Ancient Rome, and medieval Persia. Mechanical cooling has been around since the 2nd century.The first modern electrical air conditioning unit was invented in 1902 by Willis Carrier.Air conditioning was invented in 1783