I have a 100 year old home with abundant character ...and original windows. Before discovering Indows, we used plastic and drapes to help insulate. We purchased 4 Indows as a “test” to see if they worked and, equally importantly, didn’t change the appearance of our windows. We have had them for about three weeks now and are very pleased with the quality and appearance. Indows is a great product and expect to order additional inserts for our other windows. In addition, the sales representative I worked with was knowledgeable and helpful. Overall, this has been a great experience!