Heat Lamps are not advised for Chondros or ETBs as they do suck out the humidity. That being said, Emerald Tree Boas do not require high temperatures.
I use tubs, but I'd imagine acrylic holds heat and humidity almost as good as plastic tubs.
http://www.emeraldtreeboa.org This is a good Care Sheet for ETBs.
http://www.sprucenubblefarm.com/anim...ncaresheet.php This is a good Care Sheet for GTPs.