My big gal Lucy used to have her own room. It is now full of more cages to help house my 60(+/-) snakes.
Here is a pic, and old one, but a pic of her set up.
I had to house my male green in with lucy for a week when I was having housing issues. He chased her all around the room as she shed(hence the mess), then nailed her. I quickly put a stop to it so there would be no more normal burms born into this world, but this shows her set up. The room was 12x12, had almost a pool for a water dish, a baseboard heater that never got hot enough to burn her and a humidifier/air mover to keep even temps in the room and which also was used for a warm spot for her to curl up to.I never once had a problem keeping her warm enough or anything.She seemed to love it. It was nice while I had the room.*sigh*
Sorry the pics are so bad. They were taken about a year ago with my old crappy camera...lol -but you get the idea...