During the winter the humidiity stays at around 50 - 60% without the light on, but when I turn the heat light on the humidity goes down. So, when I turn the light on put a towel over the screen to retain the water vapor. During the spring and summer the humidity is a lot better. I need to give him a different substrate then what I have in there. It is a little to dry for him right now. I am going to put some reptile bark. It holds the humidity better than the aspen shavings. But for the most part I love the look of the glass cage and screen lid.