I think a 'Chubby' will work fine. Like $1 said, it's all about air distribution. Open floor-plans are naturally easier to heat, but strategic placement of small fans will heat the house evenly. I lit our Chubby Thursday evening, and I run it at 250*-300*, with the blower rheostat on a low setting. It uses 15-20 lbs./day. Outside temp-25*, inside-70*(living room, kitchen, dining room. 2 bedrooms and bath-65*) This is a 1954 single story, 1450 sq.ft. ranch. Hope this gives you an idea of Chubby's heating strength.