Instruct: Classify a given review as either positive or negative.
Query: No good

I'll keep this short. My sons room is 10'X12' and this heater could not warm his room up more than 3 degrees despite running all night. Plus I noticed that the fan blows at a constant rate whether you switch it between high or low, that baffled me. Heat couldn't be felt from more than 18 inches away. I am returning it today.