I've heard both the "raise the humidity" and I've heard the "lower the humidity" opinions.

I'm of the belief raising the humidity is better, in most cases. I believe (strictly MHO) most people maintain Boa constrictors at too low a humidity. I'm guessing most of the time with most common set-ups at about 40% to 60% relative humidity. For my $.02, I think most Boa constrictors should be kept at about around 60% to 80% relative humidity. I've noticed my boas will opt for more humidity over temperature more often than not. Commented about that previously here.

My experience has been, I get the whistling behavior from my boas when things are too dry.

Now obviously, if you've got condensation and slimy mold growing, your humidity is too high, but I doubt that is the most common condition. Most people have a closed system with some ventilation, electrical underbelly heat (or worse, incandescent lights), a very dry and absorbent substrate, and with very little water available. That's why I provide a large water bowl -- to hopefully increase humidity. Boa constrictors have a very fine thin skin, in my opinion. Compare them to their cousins from Madagascar. It's a much thicker hide with the Madagascar group. Boa constrictors are creatures of hollow logs, if you ask me. I'd guess that would be their perfect micro-habitat.
jsc
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"As hard as I've tried, just can't NOT do this"
John Crickmer

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