Ahh... Well I like to stick damp sphagnum in both hides, but it just depends on the needs of your snake and the overall humidity in the tank. If it starts to dip I would go ahead and put the damp stuff in the cool hide. Also keep in mind that if you have damp sphagnum in a hide with your snake, your overall humidity on the hygrometer may read lower than the humidity in the hide that your snake is getting. I also find that the more damp sphagnum I put in the tank, the longer I retain overall humidity, which means less misting.