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The product's description and information does NOT SAY ANYTHING about the FACT that this film must be applied to the OUTSIDE of double pane windows.....................IF APPLIED INSIDE....TO DUAL PANE WINDOWS.......HEAT WILL BUILD UP BETWEEN THE PANES.....YOUR WINDOW WILL CRACK.....GETS VERY....VERY...VERY...HOT......ALMOST TOO HOT TO TOUCH....IN 60-70 DEGREE SPRINGTIME WEATHER (the application paperwork that comes inside the box, says [ONE TIME], the film is to be applied on-the-outside of dual pane windows) I did it anyway since I'd already paid for the film..I-would-not-have-bought it if I'd known.. ......GLAD I DIDN'T APPLY IT DURING THE SUMMER....WHEN I TOUCHED THE GLASS AFTER IT WAS IN THE SUN....I KNEW IT HAD TO COME OFF........ APPLYING IT ON THE OUTSIDE IS NOT AN OPTION HERE(outside animals)....SO I'M OUT THE MONEY I PAID TO COVER MY SLIDING GLASS DOORS!!!!