Florida houses had Dormer windows so instead of half of the window, when you cranked that baby open, you got it from the entire size of the window. They also put more windows in the homes so that you had cross ventilation and they houses had more insulation. Up until 3rd grade, we had an older house from the 60s and while we had AC, we seldom ran it. My grandparents house had a giant window unit in an addition that they put on in the 70's.
I didn't have a car with AC because my parents were either cheap or poor (depends on who you ask) and never bought a car with AC. Remember vinyl seats and no AC? If it wasn't for the sweat pouring off of your legs, you would stick but the first couple of minutes you could give yourself 3rd degree burns sitting down on those things.
My wife grew up in NE Pennsylvania so they never had anything but a window unit. When we moved in 3rd grade, we got a house with a newer more efficient AC so they ran it more often, but still not a lot. I remember watching the Earthquake baseball series with the windows wide open and the fan on full blast.