#2. To increase the energy efficiency of windows, additional glass pane is added. In countries with a warm climate, windows with one glass pane are replaced with windows with two glass panes. Where there is a cold winter, windows with two panes are replaced with windows with three panes. Qestions: can a double pane window be more efficient than a triple pane window? Can a single pane window be more efficient than a double pane window? If yes, what is needed for this? Support your answer with appropriate calculations.