Hi Dan, you might find that one of the problems in Houston is the humidity. If you aren't used to high humidity you might need an adjustment period. Having access to shower facilities isn't a bad idea, and like Sirrus said, you definitely want to drink water like a fish throughout the day. The heat itself isn't really unbearable though if you are in decent shape. I bicycle commute in Austin where we normally have slightly higher temperatures but lower humidity than Houston, and the summer sun doesn't bother me.

Welcome to Texas!