We noticed the difference in our home the first night. Our family room has always been cold. After 20 years in our home, the family room is finally comfortable.I was very impressed by the hard working and well coordinated team who replaced our windows. Young, who led the project was available and helpful. There was not the slightest bit of mess or debris even after the first day when they knew they would be returning in the morning. A positive experience with the installation and pleased with the windows.