We bought an 2300 sq ft remodeled farmhouse (1845) and are looking for the most effecient way to heat. Most of the house is heated by a gas furnace. We have an oversized extra room, computer room and bathroom that are heated by electric wall heaters, (this part of the house also has no basement). We learned very quickly the expensive cost of running electric heat. We have also built a neat barn door to close off this section of the house during winter. Is it best to run more heating ducts into the other part of the house or look into a pellet/corn stove to heat the whole house? It has a pretty open floor plan. I am worried if we run more ducts, the main living area would be colder and the furnace would run a lot longer. I am worried if we look into a pellet stove, the basement would not get enough heat and the pipes will freeze. (i don't think we can put the pellet stove in the basement, but I could be wrong) Our furnace is 97% effecient and about 7 years old. How do we know which will be the most cost effective way of heating an old house?