No Chimney?!

A young student asked me earlier this week, "Do you have a chimney?"

"No," I replied, without really thinking about the question.

"Then how does Santa get in to bring you presents?" he asked, horrified.

I was stymied. I never believed in Santa as a kid, so I don't even know what the right answer to this question is. Does Santa come in windows in homes without chimneys? Does he break down the door? Does he have a spare key? Can he walk through walls?

I hope my answer, "I'm sure Santa can always figure something out!", didn't fall too flat.