These curtains are wonderful! We noticed a big difference the first night they were hanging up. It gets cold here in No. California but the curtains help keep the heat from the fireplace in and therefore we are using less wood! Also, the "blackout" effect is super. Close the curtains during the day and you have a movie theater in your own living-room (or whatever room you have the curtains in). The quality of the curtains is outstanding they are heavy-duty without being heavy. I love the grommet feature, it made installing them a breeze and opening and closing the curtains is simply a pull in either direction. What more can I say? I am going to buy more of these curtains for my bedrooms because I love them so much. They are so economical and they keep the heat in. I can't wait to see how they perform in the summer as our windows are West facing and get the full blast of the summer sun - I'm certain they will make a huge difference. Buy some today!