Our basement was really cold in the winter. My computer and other hobbies are all in the basement. After being down there for an hour or more I would get very cold. Even with dressing very warm my hands would get very cold at the keyboard. So we decided to add a small high efficeincy furnace to our basement. After running it a few days we found that it does not run near as much as we thought it would. I guess it had to warm the floor and walls up some. We also noticed that our main furnace only runs a third as what it did before. I guess all the heat in the basement is rising and keeping the rest of the house warmer than it used ot be. I am very glad we did this. I can now spend hours in the basement in a Tshirt and still be comfortable.