Some higher-end windows also contain other insulators such as heat-mirror film that more than double their insulating properties to R-9 or higher. Better-quality windows are beneficial in sunny Colorado, where you want to block hot summer sunlight but let in warm winter sunshine. Triple-paned windows insulate your home and reduce street noise better than double-paned windows, but they can cost about 50 percent more. Do your math to make sure the extra expense is justified. Gas Fillers.