None that I can think of. That's what I do for all my BP enclosures and it works perfectly. Of course, you need two thermostats (or a Herpstat II), but it's well worth it to know that your temps are right where they should be. It's especially helpful to have one on each side in really cold places...like here in CO.
**Adriana - White 'N Nerdy!**
1.0 BP 'SunSpot', 0.1 Corn 'Freya', 1.0 IJ BTS 'Topaz', 1.0 ND bunny 'Licorice'