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There are a lot of aloe species that grow like trees. Below are 2 good sites to try to identify what you've got. Some of the more common ones without persistant dead leaves are A. barberae, dichotoma, plicatilis. If it hangs on to its dead leaves, has a single stem with one leaf rosette on top, there are over 15 native to just the Republic of South Africa, and then all the others up to Saudi Arabia. Fortunately, most of them like the same sorts of conditions so you don't need a positive ID to grow it well. How long since you moved to the more humid place? Could it still be adjusting? A reduction in sunlight could be more significant to it than air humidity. Did you cut back on its water? What are the symptoms of its failing?