Smith says that adding a storm window to an older, single pane window sash can double the window’s R value and allows it to out perform a double paned window with a inche between panes. That’s one reason the triple tracks make sense..Track Style Interior storm windows include one single pane, while exterior windows include two or three tracks. A two track window allows you to slide the installed pane up or down on only on the inner track. A triple track system provides separate tracks for the screen and both window panes, allowing you to move the panes up or down for cross .Triple Track Storm Window Compare all of the options available when it comes to triple track storm window units. Don’t se.e for the first storm window options you find when comparings and prices is so easy..Triple track windows feature an inside operating half screen, while double track windows feature a half screen that is housed under the exterior sash also available with optional external full screen .