Does anyone here use space heaters along with their regular heating? My mom recently purchased one of those "surge heaters" that are being advertised everywhere. The one where it looks like and simulates a fireplace. They say the heater itself is free and you basically pay for the mantle that the Amish make. I have had it for a few weeks now and on cold nights i've been using it and it really does work to keep the place warm. I always worry a little about space heaters affecting the lungs negatively but im not sure in what way they could that. Does anyone know about space heaters and lung safety?