A recent Discovery News article on Heartwarming Memories contains the surprising conclusion that remembering the past will actually make you feel warmer. This study on Heartwarming Memories: Nostalgia Maintains Physiological Comfort found that volunteers felt more nostalgic when room temperature was 68°F than when it was 75 or 82°F. In addition, a 60°F room felt warmer when participants were asked to think about nostalgic events. The study did not attempt to link completed photo books to climate, but I suspect there is a link there, as well.
So, the next time my wife feels cold I am going to break out the photo books. I will also give her a blanket.