The original spelling wasn’t aluminum, it was alumium. Which then was proposed to be aluminium in French, and got picked up by the Royal Society. After, the guy who introduced the term to the Royal Society (Humphry Davy) started calling it aluminum but the other term had already stuck.
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.