We heat entirely with wood, and it is not free. We pay real estate taxes on our 50 acre woodlot, which BTW is way more than we need, I think 2 acres would be plenty. Our house is superinsulated and requires little in the way of a heat source. We maintain two large chainsaws which run on oil and gas. But the biggest expense is the time it takes dh to fell, cut and haul the wood with a tractor. This is time he can not draw any salary. I assume we save a great deal of money by heating with wood over having to pay for oil or electricity, but it is not free.
Never doubt that a small group of thoughtful, committed citizens can change the world. Indeed, it is the only thing that ever has. Margaret Mead