First of all, which species? Montane species(like Jacksons) would not do well in the Texas heat, but veiled or panthers would do fine. I don't live in Texas, but I do keep my panthers outdoors year round in S. Florida and can give you some guidelines for outdoor keeping. Mine do ok in summer heat as long as the cage is densly planted and you provide full shade on the bottom half. Set up your auto mister to run longer in the hot months. The great thing about keeping them outdoors is you don't have to worry about drainage or lighting. I bring mine indoors only when the nighttime temperature is going to drop below 60(a few days a year), as long as the daytime temps get up into the 70's they do fine. This of course will vary depending on the species. That means you have to check the forecast on weather.com every day in the winter. Interestingly, veileds have become established and are breeding wild in Ft Myers, Florida, which is quite a bit further north than I am and it gets much cooler there in the winter. They are a very hardy and adaptable species. Sorry about the long post, I hope this helps.
