A co-worker of mine is looking to add some supplemental heat to the basement. It is a finished basement, approximately 1,000 sf (we'll assume it was insulated under the drywall). The heating for the main part of the house is forced hot air, fired by a natural gas furnace. The basement is heated (sometimes) by electric baseboard. So the question is... would a natural gas fired (preferably ventless) stove make sense to add additional heat in this part of the house, so as to make it more livable in the winter? Also, any thoughts on the total costs of using this type of heater? The temperature of the basement, if the electric heat is not used, probably stays at about 56 degrees during the colder months.