I bought one of these 4 years ago. I read the description here on Amazon and I chuckled. 700 sq feet of heating? For $1 a day? Right. It's a 1500 watt heater. It doesn't say that anywhere in the description of course. Notice there are no specs provided. No measured "BTU" rating so who knows how much heat is coming out of it? I do. Little to very little. The unit itself looks almost crude at the back where the thermostat and filter are. Almost like a home-made deal. I don't care about that though. I wanted something to keep the chill out of a decent size room upstairs in my house. The room is 15 x 20 ft and has a low ceiling. 300 sq feet. Well insulated. (Former attic space). This unit does heat it up but only if I turn it on 3 days before I plan on going up there. Sadly, it blows a very very gentle warm breeze that you can feel only if you stick your hand directly in the front of it. When they say "soft heat", they mean feather soft. So soft, you can't even feel the heat. It's pretty heavy but the casters do move it around easier. I tried to sell it a couple different times but got no takers. I think I paid $375 for mine but that was around 4 years ago. Maybe 5. I replaced it with 3-425 watt convection wall panels. That's 1275 watts. They too are slow to heat, but they're dead silent and it gets toasty in there far quicker. By the way, don't let ANY company tell you how much something costs to operate other than your power company. You pay for "watts". Volts multiplied by amps. The lower the watts, the cheaper it will be to run though if you get something too small, it's ineffective and could end up costing you more because it never turns off. Which brings us back to this Sun Cloud heater....