You need to keep in mind the needs for all the residents, then tweak individual tanks for higher temps. as needed. Therefore, if that was my snake-room, I'd go
for 75* (or 72-24* should be OK), because corn snakes like & do well in low to mid-70's with one corner with UTH for mid-80's warmth to aid digestion; your boa
will like it somewhat warmer (but when I had a BCI for many years, she often sought the 'cool' end of her tank at 75*), so insulate the cage and tweak the heat
sources, and do the same for the BPs, all of which need the most warmth. They'd all enjoy more humidity, but that's a challenge in winter, so again, you can add
humid hides to their cages (& mist now & then, especially when shedding)...they should be OK. "Nature" isn't totally consistent or perfect either.
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