In the wild (such as brazil) boas often do see temps in the low 70's at night. I don't think cooling is required for most forms of Bci but for Bcc it is a must.
If these lower night temps did give boas an infection there would be a lot of sick snakes in the wild. Even in the tropical parts of the world their winter nights can get cool. I think a small night drop in temps is natural for boas and one of the triggers to breeding. Gus @ rio bravo reptiles has a very good page about this on his web site...and I think he nails it.

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