1. The first modern air conditioner was invented by Willis Carrier in 1902 for a publishing company in Brooklyn. The machine kept temperature and humidity low so that paper didn’t expand and contract. Carrier never intended for his invention to be used solely for comfort.
2. The most common versions of air conditioner use a refrigerant, a chemical whichcan change easily from gas to liquid, to cool the area.
3. Theaters were among the first places where most people encountered artificially cooled air, and in the hot summer months, movie houses were often the coolest places in town.
4. The development of effective temperature control and refrigeration by ACs has revolutionized almost every aspect of industry including Computers, Storage, Manufacturing etc.
5. Air-conditioned hospitals helped defeat malaria, decrease infant mortality, inhibit bacteria, and advance developments in surgery.
6.Before AC, most industry traditionally slowed or stopped in the summer, when buildings were hot and workers were sluggish.
7. Today's glass skyscrapers and low-slung tract housing don't have the same ventilating and heat-defeating features, so going without AC today feels more unbearable than it used to.
8.There's scientific evidence showing that spending too much time in cool environments erodes humans' natural tolerance for heat.
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