Basically, I built my coop so that it faces the South side of my barn with the roof running up to the barn leaving a covered 42" area that runs the length of the coop and beyond the coop to the east. Now the human door is just over a foot in and is 36" (actually a stormdoor) and the pop door is just a few inches past the door. There is a metal door with hardware cloth above and down the coop side between the human and poop door so I can go in the coop without going in the run and vice versa. Now should I place the unit inside the coop on the wall by the door frame facing a 61x32" window so it gets the west facing light and some even from the door or try to put it on the outside in the covered area? If it can go on the inside I won't have to build a new door slide since I put a sliding frame on the inside for my plexiglass door and a wood manual swinging door that I shut from the outside as s second line if defense when I get home and open when I leave for work between 4:30&5 A.M. I will try to get a photo of the spot inside the covered area in the daylight as it was not done when I took photos. Here is the west window it would be inside near where the edge of the door frame you can see though the window in this shot.