Since RetroFoam was installed in my house, I can tell a noticeable reduction in noise from the street and the neighbors on either side. As far as comfort, my house maintains a constant temperature upstairs and down with a maximum of three degrees difference EVEN in the winter. My daughter’s room is above a non-heated garage and she tells me how nice and cozy her room is now. RetroFoam was a great investment! -- Brian K.