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The fuel economy hit to run the compressor varies by car and motor size. A Geo Metro is going to take a much bigger % hit then a 2500 Ram Cummins.
Also realize most cars will run the A/C in defrost mode even if the A/C setting is turned off. I hate that in Montana, that is useful only in very humid areas.
A/C is one thing I will gladly take energy hit on. My work truck lacks A/C and I waste a lot of time dreaming of redneck cooling ideas as I boil away in an aluminum box.
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