Meets our needs for heating a glass enclosed sunroom, 9X12. It is very quiet and reaches the desired temp fairly quickly. Great safety feature as it shuts off if you move it or it falls. My dog is fine around it, which is something I was worried about. I love that we can also use as a fan and it oscillates. Very compact--needs one foot clearance from combustibles on sides and back, and three feet in front. It works well for our size room and I'm sure larger would be fine;however if you had a very large room or entire lower level, you might consider two.