The first modern air conditioning system was developed in 1902 by an electrical engineer named Willis Carrier. Mr. Carrier was working for a publishing company that was having trouble with the paper stock absorbing moisture from the humid air at their manufacturing plant. He came up with the idea of cooling the air by blowing it across chilled pipes. Since cool air can’t carry as much moisture as warm air, the process reduced the level of humidity in the plant and minimized the amount of moisture that could be absorbed by the paper stock at the plant.

Cooling the air, in fact, was just a side effect of the moisture removal process. But it didn’t take Mr. Carrier very long to realize the potential of his new invention. Soon after that, air conditioners started popping up in public arenas like movie theaters and restaurants.