I love my Windmill. It is quieter than the one I had before, it cools better, and it looks nicer. Also, it fits in my 39" window (wider than specified.) I asked if there was an adapter I could buy for the larger window. Francesca answered almost immediately even though it was Sunday: "...accordion side panels, which can go from edge to edge for up to 40" wide...the cosmetic foam panels that we send along with the unit to cover/hide the accordion panels for a sleeker look... can only cover up to 38", hence there would be a small gap exposing a small bit of the accordion panels" but not an actual opening for flies to get in. So, I ordered it, and it arrived in no time. I was able to install it (with a helper--it takes a holder and a window closer) before the heatwave that hit here last week. Even with the 1/2" gaps on either side it looks pretty sleek. I'm very happy I with this a/c unit!