Well, the glass tanks with screen lids aren't working for me. THe lids never fit properly. I have 4 different sized tanks with lids and each one worries one. My hatchling managed to escape from the one I thought was the most secure. So, I've resorted to taping the lids around their perimeter. But after a "tape accident", I've vowed no more tape.
Straps won't solve the problem as the corners have gaps. I don't want to use plastic tubs as I have the vivs decorated quite nicely and it's nice to see the snakes exploring.
So back to the drafts question...My house is about 70-75 degrees. Snakes spend most of their time in their hides, and the warm hides are cozy, so why would drafts be a problem? The only time the snakes are prowling is at night and when their are searching for food. Our household is sleeping so no doors are being opened, no fans are on, they'd have a heat lamp, so wouldn't that work?
Cheers, Carolyn