GREAT WAY TO SAVE ENERGY, THEY PROTECT THE EXISTING WINDOWS, AS WELL AS INSULATE THE HOME FROM ALL OUTSIDE ELEMENTS, INCLUDING DISTRACTFUL NOISES.BEST OF ALL ASIDE FROM BEING WARM IN THE WINTER AND COOL IN THE SUMMER, IS THAT THE INTEGRITY AND ORIGINAL ARCHITECTURE OF YOUR HOME WILL REMAIN INTACT AFTER THE JOB IS DONE RIGHT.