My wife and I lived in a rented brick farmhouse for a couple of years while the new owner saved enough money to start renovations. The exterior walls were not insulated, so we closed off all the rooms except the kitchen, bath, and a small room that we used for a bedroom. The first summer there, I had logged, split, and stacked enough wood to fill the whole furnace-room, and I was pretty proud of myself until I talked to a neighbor who had actually grown up in that house, and he told me that wouldn't be enough. When they lived there, they only heated those rooms that we left open, and they filled the furnace room and much of the cistern-room as well. I ended up with over 20 cords of wood, and had to cut extra over the winter to keep from running out. Brrr!