This is my male albino's last setup (before I moved him into a glass display tank, but I don't have much humidity problems here...)
In a 66 qt latch sterilite tub. A million times easier to maintain heat and humidity than a glass tank. When it really gets too chilly, I put a humidifier and a room heater for the entire snake room.
If you're having trouble, you can consider moving him to a tub setup like this over the cold/dry season.
You can also just post pics of your current setup to get advice?