1867
Ancient Iran had air conditioning
(lemmy.world)
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A modern home ACs can only cool about 20f below the outside temperature. 50c to 35c is 27 degrees so that's pretty damn good for a fancy unpowered swamp cooler
Yeah, the thing is the "unpowered" part. Look how much energy an AC chugs to achieve that cooling. This tower uses wind power to do it's thing.
The AC is also small compared to a literal building with a sewer underneath and doesn't require a windy day. Trade offs