Exactly what I was about to ask...thanks Del.

Yes, using the foil tape can be faster, but you would have to place it sticky side UP so the reflective part is facing down into the cage to reflect the heat (Also, as said, to make sure the snake can't come in contact with the VERY sticky underside of the tape). Since the sticky has to face up, you need to cover it with foil or duct tape anyway...so why not just use foil and duct?

Oh, and yes, snakes CAN get their tongues into those tiny holes in screen tops. I've seen mine do it.