I bought some 5mm foam sheets at hobby lobby to insulate 2 sides of my tank. With the insulation and a CHE bulb I'm able to keep my ambient air at 80-83 consistantly. Then I got a container and drilled some holes in the top of it and placed some wet sphagnum moss in it. The moss container helps me keep my humidity at 55% pretty effectively. I have a space heater set at 72 in that room and my uth with a thermostat reading 88-90 on the substrate. All of which makes for a happy girl. That set up works for me if that helps you at all.