When we lived in Texas, we were coming from extreme upstate NY, so our cars didn't have air conditioning.Air Con is pretty well essential though I guess?
It was absolutely brutal on the commutes and just driving around. Thankfully, my commute was around 15 minutes, but many a day, I forgot to do the locals' trick of putting up a sun blocker over the windshield and laying towels across the seat, dash, and steering wheel.
4:30PM would roll around, I'd beat it to my truck get in, hit the vinyl seat and burn my backside, even through my clothes. Then I'd have to open the windows and let it cool down for a half hour before I could get back in.
My poor wife...her commute was 45 minutes to an hour, no A/C, and bumper-to-bumper traffic, so no way to even get a breeze going. She's come home every day, completely drenched in sweat, looking like she'd just fallen into the pool, beet-red, and her bushy, wiry, thick hair shooting out from her head like I don't know what.