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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• who doesnt change temp every and who breeds year round? - SNAKEMAN12345, Wed Mar 30 21:09:34 2005
• RE: Temps..... - ajfreptiles, Wed Mar 30 21:35:05 2005
• RE: Temps..... - SNAKEMAN12345, Wed Mar 30 21:43:41 2005
• RE: Temps..... - ajfreptiles, Wed Mar 30 21:58:23 2005
• RE: Temps..... - SNAKEMAN12345, Wed Mar 30 22:16:38 2005
• RE: who doesnt change temp every and who breeds year round? - johnriz, Wed Mar 30 21:36:14 2005
• RE: who doesnt change temp every and who breeds year round? - bthacker, Wed Mar 30 21:51:12 2005
• RE: Year round..... - ajfreptiles, Wed Mar 30 21:49:46 2005
• RE: Year round..... - SNAKEMAN12345, Wed Mar 30 22:11:01 2005
• RE: Year round..... - Paradigmboas, Thu Mar 31 13:23:19 2005
• RE: Year round..... - ajfreptiles, Thu Mar 31 13:53:17 2005
• RE: Year round..... - Paradigmboas, Thu Mar 31 14:08:30 2005
• Jeff Ronne! n/p - ChrisGilbert, Wed Mar 30 22:04:28 2005
• RE: who doesnt change temp every and who breeds year round? - matthewpope, Thu Mar 31 07:22:53 2005
• Sorry Matthew - Paradigmboas, Fri Apr 1 01:00:33 2005