I hear alot about inserts, freestanding stoves and outdoor wood boilers, but not much is said or heard about add on wood furnaces. I have a us stoves wood furnace and I love it!! I have an 1800 sq ft home and have burned nonstop since the middle of october. I have only used 4.5 cords and the hse stays a fairly constant 70-74 degrees. I do not have any hot or cold spots in the house. In my way of thinking or atleast for my need this would be a more economical than an owb and more even heat then an insert or free standing stove. Why are they not more popular?