They would hang wet sheets inside the screened panes, and as the warm air passed through the screen, it would be cooled by the wet sheets. That cooler air would circulate slowly, cooling the sleeping area and easing the suffering that summer nights could cause.
The Today's Coolers Technology
Today we have the technology to cool our indoors sleeping and living quarters much more effectively, but one of these technologies, the air cooler, works very effectively on a similar principle as the one employed by those earlier cooing attempts.
Different types of evaporative coolers
How an Evaporative Could Be Your New Cooling Technology
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