1750
Ancient Iran had air conditioning
(lemmy.world)
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This is obviously an objective criteria, so the mods are always right. Or maybe mildly right? Ahh.. what do we know?
Just post some stuff and don't spam.
Wikipedia claims "greater than 15 °C." Besides, even if you supplement it with air conditioning, that's 15 °C less ΔT worth of electricity you have to pay for.