Well, the way I see it, A/C serves dual purpose. In addition to keeping the occupants 'comfortable', it also reduces the likelihood of the car's upholstery absorbing large quantities of the owner's sweat, and therefore B.O.
I remember looking at a used car once, that didn't have A/C. Apparently the car was 'new' to the lot and they didn't 'clean' it up yet. So, when the salesman opened the door of the car for me, we all started gagging on the odors that flooded our senses. I'd never seen a salesman shut a car door faster and request maintenance to bring out a 5 gallon bucket of Febreeze faster!