If you have an inverter type air conditioning system that you can use for heat then this is the most cost efficient way of heating although to get the best out of them you need to put your ceiling fans on the winter setting, clockwise rotation, to push the heat down from ceiling level.
The next most efficient heating are infra red heating panels. These look like flat oblong boards that you hang on the wall and plug into a socket. They work by heating up the walls and not the air. They use the most electricity getting the room up to temperature but then they just tick over to top up the heat. They are designed to be left on rather than turning on and off like a conventional electric fan heater. You can get some panels that just look like pictures and so are not ugly when hung on the walls.
