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The trouble with using Peltier junctions in the seat is that the heat has nowhere to go, and now there is more of it. If you are going to have to ventilate the seat anyway, natural evaporative cooling may be sufficient. If not, there are more efficient ways to pre-cool the air by a factor of four or so.
I'll be investigating the efficiency of just compressing air and cooling it back to ambient, or perhaps adding evaporative cooling, and then expanding it again to provide a flow of cold air. Just using a 12v tire inflator would probably not be very efficient, but it might concentrate the cooling effect enough to make up for that, and offer a savings over whole-car cooling.
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There is no excuse for a land vehicle to weigh more than its average payload.
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