12/26/12
A portable space heater can be an energy-efficient way to heat up the room you're in without having to crank up the thermostat. The best way to use a space heater is to leave it on the floor -- not on a small table -- since heat rises. Leaving it on the floor allows it to heat up cool air as it rises, giving it the maximum amount of efficiency and the highest level of comfort when it's turned on.