In the wild these animals can thermoreulate as they choose.
(weather permitting). They spend a large amount of time deep in burrows at (approx) 65-70 in warm months and 55-65 in winter.

But...they come out and sun themselves when they need to.
Ever take the surface temp in the sun? It can be 90 on a 50 degree day.

I go by the thought process that it's best to similate this and have the low temps mentioned above for the cool side and have basking place during the day allow themselves to heat up to the 90's, if they choose.

In a large cage with a heat source like a heat lamp at one end, they have a whole range of temps to choose from.

Some snakes like smaller colubrids seem to do ok in captivity at the more or less constant 78-83 that herp keepers provide, but indigos just seem to require self-regulation.

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