I am looking at a brick house built in 1929 (plaster walls) that currently has a boiler system (radiators). The house has been sitting for a couple of years and we don't think the pipes will hold up. I can get a really good deal on the house but I'm wondering what it would cost to install a forced air gas system including all ductwork. I am assuming this may be rather expensive because of the plaster walls and brick. Also the house is approximatly 2500 sq. feet.