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Ancient Iran had air conditioning (lemmy.world)

submitted 1 year ago by FlyingSquid@lemmy.world to c/mildlyinteresting@lemmy.world

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[–] Claidheamh@slrpnk.net 3 points 1 year ago* (last edited 1 year ago) (1 children)

I think I heard it's more around the 150-200% mark

Most cheap air conditioners have COPs (coefficients of performance) around 3.2-3.5, which means 320-350% efficiency. In real world conditions, the best systems reach 4.5, though the theoretical limit is about 8.0.

[–] chronically_crazy@lemmy.world 1 points 1 year ago

3.2-3.5 is also on a good day. It might not be as efficient when the outside temperature differences are further away from your thermostat setting inside, though if you have a geothermal setup, then you've got peak efficiency year round.