You don't say what type of cage, tub or aquarium you are using but I have used a humidifier for the room to keep the humidity up a little at approx 50%. This seems to do fine with the rack system as the tubs stay at or above 60-65% generally. In my aquariums, I heard of using a ball of moss inside a nylon stocking and tried this for a while but switched to using a damp sponge that I place on top of the warm side hide. This brings the humidity up inside the tank (instead of trying to make it rain in the snake room).. If the sponge gets dirty I just throw it away. They are 2 for a dollar at The Dollar Tree so much cheaper than sphagnum moss & cleaner too. I have found that the larger the hide the sponge is placed on the better this works. Hope this helps.