Rainbow boa temps.

So this morning I woke up an noticed my brb want in her normal hide... I seen her and something was wrong, she was alive, but wouldn't move... sort of like he was a lil frozen:(

It got cold last night and I was un aware of the temp drop. My question what is the absolute lowest temp I need to watch b4 it hurts my brb? I will be either moving to a tub with uth on all day and night, or switching over to a 24 hr red light bulb.. everything else is good, just having troubles with the cold weather on way.

Thanks!!

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I've been checking some caresheets on BRB's and they are all pretty consistent with low temp recommendations in the mid-70's. I imagine that, as with most snakes, repeated exposure to lower temps greatly increases the risk of a Respiratory Infection. As far as a fatal low temp, I haven't found anything specific. I would think that a for sure fatal temp would be 32F for a cold blooded animal as the water in their body would start to freeze...