My Indow window inserts are AMAZING! We have an old farmhouse with old windows an decided to try the inserts so we could retain the character of the old windows. We decided to try our master bedroom first to see how they worked. It is amazing how much warmer our bedroom stays in the coldest part of the winter (-16 degrees outside!) and even how much quieter the room is when the snowplows drive by. The measuring kit was easy to use and the inserts fit perfectly. With the color selection, the inserts are barely noticeable. We will be outfitting the rest of the house this year with the Indow inserts.