I use single heat on my Boaphiles. My room temps are about 72 year round, they are stacked and the only exposed face is the front though. I get perfect gradients setting the heat to 90 or 92 depending on the boa and it's preferences. Individual thermostats really help.

The following was taken from the boa care section on RioBravoReptiles.com:

Boas thermoregulate in subtle ways by raising and lowering the mass of their bodies on a heated surface; this is largely denied to them by using radiant heat.

If your ambient temps are too low a room heater is best, instead of radient heat panels. The panels are good for many species, but boas are not one of them.
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http://www.GilbertBoas.com/

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