Air-conditioning requires a mechanical compressor, which you could drive off your drive motor, but instead you want to run an AC compressor off of DC current...? I don't know of any DC powered refrigeration units except for small Ice Chest coolers. Standard automotive AC is a "Split system"...
Perhaps to reduce the power consumed you could drive the compressor with a variable speed drive and regulate the air temp with speeding up or slowing down the compressor mechanically, instead of cycling it on and off as is usually done in normal AC Systems. There is also Absorption Cooling, which uses Heat to make cold, like the Propane RV refrigerators use, while driving they uses an electric heating element to provide the heat, though not very efficiently. Good luck!
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