I bought a portable oil filled heater and it warms a room and keeps it warm. I was amazed what a great job it did. I had to turn it down to keep the room from getting too warm. It is a radiating heat and is much more efficient and cheaper to run then old space heaters. And safe for kids, it doesn't get hot enough on the outside to cause burns or catch anything on fire. Be sure it is oil filled. Not the cheap ones.