Just to clarify, I never said the ambient temps in the tubs or tanks was 66-69. I said the room temp is 66-69 and it most certainly is in the winter. Sometimes lower.
I have found ways to increase the ambient temps in the enclosures using various heat sources and insulation. There's lots of good info on this site.
The point I was trying to make is that no one should be discouraged from keeping snakes because they can't heat an entire room to 80+ degrees. It would be easier but not everyone can do it.