You really need to get your humidity up to between 50-60%.
What are your warm and cool side temps?
If he is drooling, and it wasn't just from a recent drink of water, then you need to listen to hear if he is making any cracking or popping sounds. Also, if you can, look in his mouth. Any mucous? Is he blowing any bubbles around the edges of his mouth? Any of these symptoms are typical signs of an RI and a vet visit would be in order
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