I wet down all the cedar when I received, it seemed very parched. Since then, humidity has been rock solid. I usually use 4 or 5 hygrometers with +-2%. I had to set it a couple of % lower to get the right setting, but it stays consistent with only a distilled water fill. I ended up getting some cedar to make side rails for the shelves, it can hold a good many since then. No complaints. Would buy again.