I grew up in Henderson, NV, near Las Vegas, the summers were hot 110-120 or higher, no humidity tho. Swamp coolers were great. Now there is too much humidity that they don't work so great. 4 years ago changed from swamp to AC. Hated it.
First time I went back east to visit in laws, I took blow dryer to dry my long hair. Lol. It was 90 with 90% humidity. Tried for 20 minutes to get hair dry. Didn't work. Had to get back in shower to cool off. Lol