Thx David.

The only thing that concerns me is the ambient temps dropping below 78 in the winter. I close the air vents in the critter room during the summer so they're at 78-81 now. We're in a new house and this will be our 1st winter here but the daytime ambient temps during winter at our old place hovered around 75 and went as low as 70 on some winter nights. Will they be ok as long as they have a good hot spot? If not I can put a heater in the room. The new guy is going in a tub until some time next year so all he'll have is a UTH.
I use Reptile Prime bedding which holds humidity pretty well so I think I'll be ok there. It's easy to stay in the 55-75% range.
I usually cut 1back on the food quite a bit for most of my critters during the winter. They may eat once every 4-6 weeks and a couple of them don't eat at all from Nov-Mar. Is that ok for boas too or do you all feed year around?