I wanted an opportunity to respond to the "most efficient auto ac compressor" but it was closed already. Here is some actual user experience in this issue. Restoring a 1977 VW van with factory ac. The original York piston compressor took 13 horsepower and man on a VW van, that is a heck of power draw! I put in all new original factory components and had a Sanden ROTARY built to fit the VW van. Horsepower draw was only four horsepower which is a phenomenal difference. I would have to go with Sanden rotaries over anything else I know of. FYI.
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