Santa

Megan and Matthew are discussing how Santa gets in the house on Christmas Eve. Megan says we don't have a chimney and, if we did, that's where we would cook so he couldn't use it. So he opens the downstairs door really quietly. Matthew says all doors make noise (ie, rejects Megan's theory) and what really happens is that Santa makes a chimney and then when he's done he takes it apart and puts bricks over it so air can't get in. So there you have it! Which theory is right? Will we ever know?