Well, there were a few spots of cold air coming in the house from outside that we did not detect until the weather turned colder. I thought we had done a pretty good job of weatherproofing the house, but I guess we missed a few spots.
These are easily fixed with a bit of caulking. I just have to run down to the hardware store and get some to take care of it.
We are just about ready for winter. I am rather tired of raking leaves though. :/