I was hesitant to buy this because there weren't a lot of reviews on it when I got it but it worked great. We were heating a 3200 sq ft house during February in North Idaho so we could mud and tape the drywall and it kept it around 60 degrees while it was turned up about halfway. There isn't a temperature setting. Just a low to high dial so I don't know what temperature it was supposed to be set to but it stayed around 60 in there. We had the walls insulated but not the ceiling and it still kept it warm.If you are heating an un-insulated space this probably wouldn't work. I had this wired directly to the circuit panel and before we insulated and dry-walled you couldn't really tell it was on except that the fan was running. BTW the fan always runs but heat doesn't always come out so if you stand in front of it you might just feel air blowing. And it doesn't put out heat the way a kerosene heater or forced air furnace does. It blows out heat that at best I would say feels warm, not hot. But if it's running in your building long enough to warm the place up it will keep it warm.The only downside to this heater is the cost to run it. The electric bill for one month of this heater running was $400 higher than the previous month. But we were heating a large space and it was only a temporary heat source that is safe to run without ventilation.I would buy again but only for temporary construction heating. Not as a permanent main heat source.