I was just wondering, and maybe I am being too simple minded...
Couldn't one put a peltier (or an array) in the engine compartment of their car (near the exhaust) and run the power into the passenger compartment to another peltier (array?) that is setup for cooling?
Kinda like an solid state heatpump? :-) If it would work, people w/o AC could get it w/o any drag, and if you are not using the cooling, you could just divert the electricity to the battery. Heck, if you had enough heat, you could run the cars inside blower motor, and keep the car cool, even when the engine isn't running.