I've got a buddy (we all do). He has asked me to change the oil forced air furnace in his cottage to a propane forced air furnace, no problem. I do have a problem with the way the house is currently ducted. This is an old 1 1/2 story home on a slab. The home has a big room that encompasses the entire lower level with the acception of an additon off one side, also on a slab, that is now the kitchen and mud room. When the house was built there was only a wood stove for heat, hence all the duct work is exposed throughout the house in a very crude manor and the furnace is essentially in the middle of the living room. I want to redo it all. I am a service technician in a metropolitan area, so working with an old farmhouse is new to me. I am looking for suggestions on eliminating this mess at low cost. I was contemplating a boiler, but air conditioning may be desired at a later date. If anyone has installed an hvac system in an old farmhouse, your experience right now is invaluable to me.