Evaporative coolers only work in low humidity climates. There are not very many of those in Texas or Louisiana.
BS - I grew up in Texas and didn’t have AC until my last two years of high school. That is from elementary to high school, no AC.
I also grew up in Texas without air conditioning, as did five generations of my Texas ancestors before me. I am not saying that air conditioning is a necessity. It is not. I am just saying that evaporative coolers are not a viable option here.