Oh dear, it does seem like I left some info out!
I have 4 Boaphile 422D's (4 x 2 x 18") and all have Pro-heat PH-3 12 x 18" 65 watt panels. The information I listed in the above post is for my Irian Jayas, we also have a Corn and Brazilian Rainbow Boa and the panels do a great job keeping correct temps for them as well.
The temps do drop a bit in the winter, but not by a lot. I usually end up putting larger water bowls in to hold the humidity, therefore, the temps.
I love the RHP's I have, if you are considering them I highly recommend them. Shoot an email to Bob, tell him your set up, room temps and what temps you need to maintain and he will hook you up with the right panel