I'm certainly not going to disagree with Phil, who knows infinitely more than I on these matters, but I thought the answer would have been "the same". I assumed that is what the car does itself in Auto mode, i.e. cycle the refrigeration on and off as needed while keeping the fan running.Aneelam wrote:I know someone who, on very hot (25+ C) days, runs her car air conditioner until the car becomes comfortably cool, then turns off the AC without turning off the fan or closing the vent. I think this is rediculous. I got to wondering, however, whether it would take more, less, or the same amount of energy just to run the air conditioner continuously than to turn it on and off while keeping the vents and fan going.