Annnnnd I'm already helicoptering. Though kind of a good thing this time because the temps are a bit wacky. The ambient is in the mid-high 60's according to the thermometers I have on both sides of the tub so I cranked up the CHE to try and get it to around 70. All that did was bring the area directly below it into the 90's so I quickly turned the setting down. It was only in one tiny spot thankfully so he could easily avoid the overly hot area. The weather's supposed to warm up again soon and stay that way (the heating isn't the best in my house) so it should hopefully be okay until then.
I did find him resting where the heat mat is though, which I carefully set to the lower 80's so he's assuredly warm enough at least.
I know he's a corn and they're perfectly adapted to fluctuations and lower temperatures, but he's my new baby boy so I can't help fretting.