I am growing Phal. parishii on a north windowsill in Las Vegas, NV, and the humidity is currently 33%, which is actually pretty good for me. It can get down to the high 20's. My plant is potted in not-too-tight sphagnum moss, and seems to be growing well. Yep, I just popped it out of it's clay pot, and there's roots growing well down there. I know I should try to keep it evenly moist, but it does get a bit dry once in a while with no ill effects. If I've got growing roots and new leaves, I'm happy.
Go for it!!!
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