Swamp Cooler 9 Hours Sleep Sounds

Swamp Coolers are used to cool the air in dry environments like Colorado. They're also known as evaporative coolers and function by blowing outside air over wet pads. The pads cool the air and the cool air goes in the house while the warm air is pushed out. 

The original concept was also used by the ancient Egyptians who had servants fan wet blankets to cool spaces down.

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