need advice regarding heat

[Erin K.]

We have a small one-story (~900 sq ft) *uninsulated* brick house we purchased recently.  It is one story and the current heat is 2 ventless wall heaters. No ducts, no baseboard heat, small crawlspace but not even sure it goes under entire house.   I do not like the smell these heaters give off, and I think this heating source turns off potential renters.  House is very nice inside otherwise.  There is a fireplace. I am considering some type of pellet stove that vents out the chimney. Any other suggestions? One of the wall heaters has a broken ignitor button right now that needs repaired, so I have had an Edenpure electric heater in there this past month to supplement the one wall heater and of course that increased electric bill a lot.  I need some creative ideas for heat here.  Anyone??