I purchased this Carona Kerosene Heater to keep my basement warm during the winter months. While we mostly use this in the basement, it is portable enough to bring up stairs to provide a little extra heat.
I have an unfinished basement, but we do laundry down there and my wife has a class room down there where she homeschools our son. The basement maintains about a 58-60 degree temperature most of the time, but it can be cold down there in the winter. This kerosene heater works very well to heat the space at a very reasonable cost. There are some safety features that I really like. For example, it is caged, so it would be difficult for a child or pet to get burned. It also has a nice wide base making it hard to tip over. There are also, very little fumes associated with this heater. Overall, we've really been pleased with the heater. I would suggest keeping a carbon minoxide detector in the area of the heater, just to be on the safe side.