I'm not sure witch would be the better unit to put in my addition.I have fisher grandma (i think that is what it is)or a blaze king(princess)it has a blower on it and is in pretty good shape (both are in good condition) my house is a single story 1500sq. ft. also would someone know anything about the blaze king by this model #ptj 202. icbo#3634. serial #ptj 3577.thanks for any help or suggestions.