I like my hearing to much to not have AC on trips at 55 MPH or greater. Ever notice which ear most the baby boomers lose hearing in first?
Back in 93 my vehicle was a 1990 Montero with no air conditioning. I was stationed at Fort Bragg, NC and was sent to a military school at Ft Huachuca, AZ (about 70 miles SE of Tucson, right next to Sierra Vista.) I finished the school in July, and by the time the school ended, I had 2 1/2 days to make it back to Fort Bragg (which is in Eastern NC.)
Driving across Texas in the late July heat in a vehicle without AC, and with the huge "greenhouse" that the Montero had, was absolutely miserable. The only way I could even be marginally comfortable was to strip down to my shorts, put all 4 windows down and drive at 75 MPH.
I didn't even bother turning on the radio because I couldn't hear it!
I drove from Pecos, TX to Tuscaloosa, AL in one day - a little over 1,000 miles (still my personal record.) I was stopping every 2 hours or so to chug a bottle of water but never had to pee because I was sweating so much.
I took several other long trips with that Montero but tried as much as possible to travel in the Spring or Fall. Mid-summer drives were not fun! Anyway, it was after that I decided that I needed AC and every 4 wheeled vehicle I've owned since then has had it. Being miserable sucks.