[abmiller25]

I am considering purchasing an older house (built in 1920) however am unsure about the heating system. It is an old furnace that uses gravity to heat the house (relying on the fact that heated, less dense air, will rise and cooler, more dense air, will fall). I'm aware that this is not an efficient way to heat a house and am curious to know how much it might cost to convert to a force air system. It's a 1500 sq ft two story house, and I'm assuming the majority of the cost will be to add ductwork but will I also need to buy a new furnance (one with a blower to move the heated air) or can I still use the existing furnace. Can anyone give me ball-park costs on how expensive a project like this might cost??