I'm in the process of setting up some stackable PVC cages with belly heat as well, so I don't have a definite answer for you yet. I also have a dedicated room. But my initial thoughts about this type of set-up is that UTH/Flexwatt provides a warm basking spot, but has little to no effect on the ambient temps in tubs and tanks, so I assume that in a single PVC tank, the same would hold true. Now, for a stack of PVC cages, it stands to reason that the belly heat source for one tank should also warm the top of the tank below it, so, by my reasoning, it should at least somewhat affect the ambient temps on the warm end. Obviously not as drastic as a RHP would be, but it just seems that with all of the heat sources on one end, it would have to affect the ambient temps at least on that end. Hopefully someone with a definite answer will chime in...
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