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HVAC maintenance — a pretty cool idea

from John Haley

The ancient Egyptians are known for developing the concept of air conditioning. In an attempt to find relief from the heat, reeds were hung from windows as small, constant streams of water trickled down them. As the water evaporated on the reeds, it cooled the air blowing through the windows. Although this process seems extremely basic, the general physics of air conditioning has remained the same throughout history. more

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