My wife and I think two different things, and I would like to see which of us is correct. I'm only somewhat knowledgable of physics, so I may be wrong. We need an electric heater for a bedroom. My wife says we should be an energy star heater. But I'm saying that it doesn't matter which heater we buy because almost 100% of the electricity used will turn into heat (excluding some tiny amount of electromagnetic radiation). So I think all electric heaters are equally efficient. Who is right, my wife or myself?