Im pretty sure corns are fine with normal room humidity, infact anything above could cause Respiritory infections which are not good.
Assuming your snake is a corn, im not sure they do much climing, but maybe a few logs? (heat treated and/or disindected of course) and some artifical plants should be fine.
Although maybe when your snake is in shed you could increase the humidity a bit, but dont just take my word for any of this.I got my first corn today, so maybe you should wait for somone with more experiance to post.