We finally got a killing frost last night. It was a few weeks late this year. On the other hand, the heating season has started a month early. I had to build a fire in the woodstove last night. We are having mostly cloudy days so, the solar heat doesn't gain much. Last year we only had about 12 clear sunny days in the heating season. Normally its 4 times that. I burned more wood and had to keep the house cooler to save energy.
Couple of little bits of info: 1. A cord of dry hardwood burned in a good woodstove will give about the same amount of heat as 200 gallons of heating oil in your oil furnace. 2. Setting your thermostat down by 3 degrees will save 10% on your energy useage. Example: Go from the 78 the wife wants to 68 and you will save about 33%. Good Luck, Rick