my gf likes it warm, i like it cold.. here's sort of how our last argument went..
we get in the car, she turns the heater on max heat + max power.. i leave it like that for a while, then turn it off
her: "its 32º outside"
me: "yes, but it's not 32º inside the car"
her: "don't argue with me about this, its my car"
me: "yes, but im driving, and i need to be the one that's comfortable, use my jacket"
her: *turns the heater back on*
me:
her: *gets scared - turns the heater off - apologizes*