Heater heat
If it's working properly, the heater will practically melt the rubber off your sneakers -- they'll smell like you left them on the furnace grate.
If you live in an area with hot summers, odds are some ignorant person put in a 160 degree thermostat. Go with 195. It makes a huge difference.
I don't know how you can say these cars lack ventilation, with those huge barn doors in the footwell. Open those on the freeway and it's like a hurricane.