Oil-filled heaters can also come with different wattage settings. The one I just picked up (Holmes) has 600w, 900w, and 1500w settings. I don't have my thermostat yet, but when I do I will be experimenting with the 900w setting for heating my 10x12 room. You could also get a cheap bookshelf and run flexwatt (just put your bins on shelves like books) - then you don't have to heat the room as hot. I also use the "as-seen-on-tv" twin draft guards on the door so I don't lose heat into the rest of the house.