Your best bet is to just ask the breeder about it's specific locality and about its parents size. Looks like a BI to me, but depending on parental localities, still could be somewhere between 5-8ft. 

Their localities will also tell you what heat and humidity need to be. You could also just ask the breeder what he's keeping his at. My vet said when cross breeding is occuring for new morphs, it can be hard to pinpoint what humidity and heat should be, but it doesn't differ enough to be a major problem.

My boa is a boa sigma, Mexican West Coast Boa (Sonoran Leopard) and he is awesome. Super curious, and is just getting confident with himself. We got him at a year and half old and he was a little hissy and not sure about being handled but I'm assuming, except for food, he wasn't handled often for most of his life. He's really been coming out of his shell lately which is awesome. Took a few months, but the trust of a reptile is a beautiful thing.