re: Heaters - convection heaters are the best
you're talking about oil heaters.. they're pretty good (I used them for years) - but they do use up heaps of electricity, so I'd get hit by the size of the bill. In my experience the best and most efficient heaters are the convection type of heaters which are cheaper to buy and to run, and really toast a room. (the 'turbofan' on some models is just an extra- the design shape itself ensures good heatflow around a room. A bigger model should work well for a lounge room
Eg -