Heh, in my experience most Americans start complaining if the heat isn't cranked up to 80F in the dead of winter. But come summer, everybody wants the AC cranked down to 60F. T-shirts in the winter and stylish jackets in the summer, nobody dresses for the seasons.

Personally, I prefer an open window. Fresh air is almost always better than warm/cold stale air. But I think that'll kill a car's aerodynamics anyway, maybe worse for efficiency than running the heater/AC.