True.
OK, they're going for it.
I took my mom to the store yesterday and she picked out a door. It's NOT the most efficient choice: she decided (smartly) on a mostly glass (think French-style) door because the stairwell is lit by natural light from the lower level during the day. A conventional door with better insulating properties would have been more ideal from an efficiency standpoint, but it would have made for a dark stairwell when closed. (Which will be much of the time during the peak of summer.)
So it seems what we have here is a project that isn't the *best* solution, but it will be an improvement.
I'll update when the door arrives. It'll be here in 2-3 weeks.