It has been a couple of weeks since the windows were installed and we cannot believe the difference. The AC doesn’t work as much and no heat comes through the windows. It is the sliding doors that we are most impressed with. The morning sun comes in but there is no need to close the drapes because there is no heat. Patrick was wonderful to work with an was able to schedule his crew to replace all 7 windows and 2 doors in the same day. (Google Review)