I bought this for a large (400 sf) room. Based on reviews that said it worked well in large rooms I ordered it. The fact that it was so small made me nervous, bc I had guests about to stay in the previously unheated room, but this little Lasko heater proved itself!  It's super easy to figure out and works quietly. I'm now using it in my 2 car garage to warm up the space for my dogs at night. It's keeping the insulated garage at exactly the 60 degrees I have it set to, even though it's 10 degrees outside. I love it!