There are a few things to look for when identifying an Andersen Windows. The first is the window’s size. If the window is too small or if it has a small opening, it may not be an Andersen Windows. The second thing to look for is the type of glass. If the glass is cloudy or has a greenish tint, it may not be an Andersen Window. Finally, the window’s style. If the window has a simple design or if there are no details on the window, it may not be an Andersen Window.