Recently some kids on the block were playing hockey out in front of my house in the street, when a ill-fated puck came and broke my window. Leaving me with two questions. One, how bad of a shot do you have to be to shoot the puck parallel? And since I have to get a new window should I just replace all of them? My windows have been around since I first bought the house in 89 so It's about time. Plus the kids parents gave me money to replace the window. So i went out and bought 3 windows, just enough for the front of the home to look a little nicer. I got a brand called Pella ThermaStar, I never heard of them but man are they easy to install! It took about an hour to complete a window and when you live in Colorado in November that seems like forever but it was really fast. As for insullation we'll see on how much better they work than the previous windows. My guess is it should be a little more effective but who knows.