Boas do not thrive in hot dry environments. Whoever told you that has ZERO clue as to what they're talking about. MOST of the boas that are commonly kept come from a hot environment where they seek shade and cooler temps or it is greatly covered by shade (trees) and a good number of them (especially BCC) are from rainforest (high humidity) areas. So, humidity from 70-95 % is the norm. Temperatures kept in the low-mid 80's are ideal.
The big problem people have w/ excessive moisture is cleanliness. I've kept my animals in 90-95% humidity for months w/ zero ill effects, but I cleaned on a daily basis to absolutely destroy any possibility of fungus, etc... I backed it down just for my own convenience though. Now I maintain at least 70% and let it spike on it's own to 95% by keeping a water bowl on the warmer side of the cage.

or, who knows, maybe all this is just my opinion?
jb
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Jonathan Brady
"Sarcasm is angers ugly cousin" -Dr. Buddy Rydell (Jack Nicholson) in "Anger Management".

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