Cypress is the best for humidity. Make sure its grade a cypress not a blend. Do not under any circumstance mixed cypress with aspen. Aspen will mold. I run a himidifier in my snake rooms that is connected to the thermostat that controls my room heat. It stays 84 degrees with 60% humidity in the rooms and my racks and caging are all cypress. I do use paper in the fall on some of my girls that have to be temp dropped but most of my girls dont temp drop