How are you heating it?
If a heat lamp is the source and your just placing the fixture on the screen top check into a lamp stand. They are about $23 and come in a yellow box at both big pet stores. It's made by ZooMed. This would give you the ability to raise and lower the fixture which will in turn lower or raise the temp. They also extend your bulbs life because your not constantly moving it around. Plus they keep the heat over the tank so it remains warm as you work in the tank.
http://www.amazon.com/Zoo-Med-Reptil...med+lamp+stand
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