OK...It's a very interesting concept. As I've read on the forum and the idea of a pellet stove in the window I had my doubts. I happen to be passing by my pellet distributor here on Long Island and he had the unit set-up outside in front of the store running. I had to stop and take a look. I looked at this unit from every angle and felt all the parts that you would assume that would be hot and they were not. I put my hand over the exhaust area and felt a good amount of heat but nothing I would be concerned with if the unit was put in the window or wall. It has an intake in the rear of the unit for outside air. In the front bottom left corner it has the control panel that is relatively simple to understand. It has a low pressure switch light that alerts you if the hopper is open or the door is not closed properly and the unit stops feeding pellets. It has a basic heating control, I think it's 5 settings of High to Low for the amount of heat it's outputting. The fan on the unit is very quiet and blows a comfortable amount of heat. The front of the unit is not hot and can be touched without burning yourself. The hopper holds 30 Lb. of pellets enough for an overnight or day operation. I really never gave this unit a thought and thought the concept was ridiculous. But after further evaluation I think its pretty good. I wouldn't personally install the unit in a window. It is heavy, not sure on exact weight but as a wall install with proper framing it wouldn't be a problem. In some cases the unit can be portable if need be. Now, I'm not in the market for a window unit or another pellet stove but I thought I would share my thoughts to the group as I had some reservations on this one.