Air conditioning is present almost everywhere, and we tend to take it for granted, but people have been trying to keep cool long before any consistent and reliable systems came into general use. Air Conditioning History In India, people would hang wet grass mats over their windows; these would cool the air as it passed through them, evaporating the water. In the 19th century, the textile industry employed atomized water sprays to cool and humidify the air, but it was not until the early 20th century that a man named Willis Carrier devised something called dew point control. He knew that air carries water vapor and when the air is cooled it carries less than when it is warmer; the cooled … [Read more...] about Development of Air Conditioning