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.
well technically it is powered, just directly by wind and water kinetic energy, probably(?) much more efficiently than if it had been converted to electricity first
AC really doesn’t consume that much if designed and sized properly. It’s nothing like the energy consumption of standard heating. The problem is all these people going out and buying the cheapest floor unit or undersized window unit they can find, then the wheezing thing just sits there chugging 100% of the time because it can’t keep up with their space. That’s super wasteful.