If you live somewhere where humidity is in the proper range you don't need to worry much about humidity inside the enclosures. He's been working with the animals long enough to know that the relative humidity where he is located is within the proper range for BPs to live safely and thrive. Humidity can be zapped out of enclosures by heat, so, depending on how you heat your enclosure, you may need to adjust regardless of where you live and relative humidity there. He has his work down to a science and is at the point where he no longer worries about humidity because his environment, setups, etc... are all within range and have been for years.