Put in a good wood burning stove (I personally like those old trash burners with a fan on the stove pipe to blow heat into the house. We had one at our cabin when I was a kid and it kept the house toasty.) Or a fireplace insert or pellet stove.

Along the same lines of needing heat as fall advances, I turned up the heat on my hot water heater today. I'd had it turned down as low as possible this summer because the tap water was coming in warm enough for showers. Now it isn't, now I have the windows open for fresh air and I love the feel of the cool room and the hot water in the shower. Kind of the bathing equivalent of sweet and sour food. :)

SRS