I will try to help. First off, it is not a matter of temperatures. It is more of a lighting and internal clock that triggers hibernation in tegus. There is really nothing you need to do but reduce the basking light. My tegus start hibernating in August, the temps are still in the upper 90s. They do not need food or water at all during hibernation.
Tegus hibernate up to seven months in the wild. They will also do this in captivity if given the chance. However, tegus do not need to hibernate. If they do not hibernate, they may still slow down on feeding, and activity during the normal hibernating season. Note the Argentine species, and the Blue tegus are the only ones to do this that I know of. The Colombians are not known to hibernate. In the wild, burrows are usually around two feet deep and up to four feet long. Tegus will line these burrows with grasses and leaves. They will also plug the entrance with this as well.
I hope this helps, if you have any other questions feel free to ask.
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