You may consider building an outdoor enclosure for the summer months at least, it's hard to beat good old natural sunlight and fresh air to help a lizard thrive. This is a tegu enclosure I built a few years ago. It's 8x8 and I put hardware cloth under the substrate to prevent escape by digging. The tube under the chair goes down to a hibernation/sleeping chamber that's buried outside in front of the enclosure(you can see where in the first pick, on the right side - about 2 feet under the driftwood).
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