Some corn snake questions.

[Bogertophis]

Adult corn in a 36x18x18 Exo-Terra front opening for now. (still working on AP cages with radiant panels for all snakes)

The house ambient temp is 71* winter / 78* Summer , he has a UTH (an ultra therm controlled by a herpstat).

So looks like he would be comfortable out in the main room year round with out issues

That's my take on it too. Snakes evolved making temperature choices, so keeping them at one temp. that's on the warm side "long-term" is probably not the best for their health- IMO. Most of the time I see my corn snakes preferring to use no heat, just the cooler room temps that are ambient temps in their homes too. In fact I've read it's no problem even if the temps drop to mid-upper 60's overnight, but mine never do anyway...I just know some ppl like to lower the heat @ night, & as long as your corn snakes have a heat option (warm hide), I wouldn't expect them to refuse food or become ill. They're wonderfully-adaptable pets.

One thing: if your corn snake is young, it's best to use UTH, as they need to hide...but as they become adults, if you want to use any type of over-head heat instead, they'll have to adapt (be bold enough) to use that (assuming the enclosure is tall enough for them to have branches?), & what you could do is attach
a woven basket (or similar thing for them to use as a hide) to the branches so it's closer to the warmth (which rises & doesn't effectively reach the cage floor
so well). Many of my rat snakes appear to LOVE sleeping in their baskets, & they have a choice between that or a hide over a UTH. It's just something I've
noticed...they enjoy "tree houses" and it's really cute to watch.