Cuts down the draft and street noise in our master bedroom! We face the street, so this helped us reduce the noise quite a bit and get better sleep at night. In the mornings, I can tell that our bedroom is warmer and cozier than the living room, so we turn down the heat. One time we took the Indow insert out to get to the window and noticed all the cold air trapped between the insert and the window. We're so thankful for the extra layer of insulation. Hope it keeps our place cool over the summer, too. It was pretty easy to measure the window size and put the order in by myself. And our sales rep Ryan has been so helpful. Our window is really really big (the size of a king-sized mattress) and we had some trouble with fitting it into the elevator (we had to unpack downstairs and carry just the Indow insert up) it was definitely harder to put it into the window than on smaller windows I've seen on YouTube videos, but I could call Ryan for help and he offered some great tips. Then we got a good night's sleep. So worth the trouble. Although if I could do it again, I might get 2-3 smaller pieces for a huge window like this.