Especially with a B. nodosa or B. Little Stars, you may be over-thinking things a bit. Nodosa in it's native locations can live in hot dry scrub within reach of salt spray from the ocean.
I often tell people that benign neglect is a good standard to live by with tough plants like this.
Generally though, plants will take up more water during the day while they are photosynthesizing. They will also transpire more water from the leaves, and this will increase humidity near the plant. I don't know if any of the plant transpiration cools the plant, but moist media and a damp clay pot will evaporatively cool the root zone, especially if the air is dry. Unless it is bone dry winter air, I don't worry too often about humidity, but I would probably be more concerned if I lived in Arizona instead of Georgia.
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