Im looking at getting a Shelter sf1000 its supposed to be good to heat up to 2500 sq ft and my house is just a bit over 1300 sq. ft.!! Im planning on putting it within a few feet of the house in a small shed and the exsisting ductwork im running to is all probably within 10 feet!! Planning on insulating or burrying the very small length of ductwork that would actually be outside!! Ive been researching this for awhile and I think it will work! Anybody else ever done this and any helpful tips would be appreciated!