The way you have it setup is actually pretty good; however given you are in Maine and winter is on its way and you can’t control the temp of the individual room he is in, i would suggest keeping him in the smaller tank. As stated the UTH is not designed to raise ambient temps, but rather to provide good belly heat. And depending on the way you are setup, substrate, etc you can run a risk of harming the snake if you don’t have a thermostat.
Personally i have a second room that i keep at 75 ambient temp and have lamps/UTHs for additional heat for my snakes and it has served well for me thus far. But really just move him into the smaller tank it is easier to control the temps/humidity in a small enclosure.
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