I bought this to heat an approx. 150 sqft. home office in my basement. Since it's an old house there are no heat vents to the basement. I had 2 small heaters running full blast and the temperature would never get above 60 degrees in the winter. Using just this heater the temp in my office got up to 67 degrees within an our or so. The temp on the heater display is very close to my digital thermometer I have also. It does a good job for a small space. Wouldn't recommend it for a large space or garage though. If you're just looking to heat a small room up this will definitely get the job done.