I would agree with what has been said so far get your husbandry in order and the shed should take care of itself pretty quick. As for your setup I am thinking its a tank and I have a great solution for Humidity and temp stabilization in tanks.
First I covered 3 sides of the tank with aquarium background (the only good item I have found from Petsmart) just to make it look nicer for me to look at.
Second I took some cardboard and cut it to fit the 3 covered sides. Then I taped one side of the cardboard with foil tape to reflect heat back into the tank and taped the cardboard to the 3 coverd sides of the tank as seen below.
http://sphotos.xx.fbcdn.net/hphotos-...83841836_n.jpg
As for the screen top I purchased a peice of plexi from HomeDepot and cut it to fit just inside the slider top for my tank. Drilled a few holes in it for ventilation and one large hole for the CHE. Taped a portion of it with foil tape and left the back untaped for the tank light. I do like to see my snake when she is out
http://a7.sphotos.ak.fbcdn.net/hphot...64496118_n.jpg
Heat is supplied from a 60W CHE and Flexwatt 11 taped to the bottom. The CHE is set at about 50% on a lamp dimmer from HomeDepot (plan to get a dual T-stat for it in the future) The Flexwatt is set on a Vivarium VE 300 T-stat set to 96F. This keep my hot spot at 91F and ambient at 78-81F as room temps fluctuate a little. My Snake seems to love it she just got a great checkup from the vet and is eating like a pig. Hasn't refused a meal yet. As you can see in the photo below room temp was about 68f and tank temps were exactly what I wanted them to be. Hope this helps out and feel free to ask me any questions you might have.
http://sphotos.xx.fbcdn.net/hphotos-...84084614_n.jpg
