I would go Animal Plastics but then again I would say that cuz I have a T11
The heat is heat cable routed in the ext bottom of the cage and works great.
You will need a T-stat to control it. It is located on the left half of the cage.
It keeps the warm side floor a nice temp. I have my connected to a Helix dbs1000 set at 93 degrees.
I got mine w/ the 2 8" cutouts w/ screen. In my house the heat cable is not enough to keep cage warm so I have two heat lights w/ red 100 watt bulbs on t-stats to keep the air temp up in the 80's. But the heat cable does the job for the belly heat, no doubt. The humidity stays around 50-55.
I see now you can get them w/ a flo. light in the back go for that because they are dark inside when trying to clean etc. They didn't offer that when I got mine last year.
They are great people to deal with and will do almost anything you ask on the cage. Just give them a call and tell them what your looking for.
Shipping is cheap and putting together is a snap and will take all of 10mins.

I love my AP cage but most of all my Ozzy seems to really enjoy it
Hope this helps