I've never been to Texas but a Wikipedia article ( https://en.wikipedia.org/wiki/Climate_of_Texas ) suggests that 80F low occurs only in Galveston in July and it's more like 60s and 70s elsewhere. If a humidity is such a problem then you could run dehumidifier during the day and that would lower humidity ( in a sealed house ) overnight.

I mean these temperatures don't strike me as particularly intolerable. I wonder if it's the case of keeping up with Joneses as in "my house is cooler than yours". There are some reports ( https://www.theatlantic.com/magazine/archive/2015/07/saudis-... ) that rich Arabs in Saudi Arabia are running air conditioners at temperatures that require sweaters — even when they go on vacation. Which is really amusing for these of us who come from colder climates.