I'm not sure how much land you have, clo, but a friend of mine in NH has an external wood-burning furnace. He's able to dump pine, scrub, pretty much ANYTHING into it, and it keeps his extremely leaky old farmhouse nice and warm.
The drawback is that he goes through huge quantities of wood. I think he said about 25 cords a year.

Gold is $1,581/oz today. When it hits $2,000, it will be up 26.5%. Let's see how long that takes. - De 3/11/2013 - ANSWER: 7 Years, 5 Months