Is applying soundproof film to windows effective?

Window soundproof film is a product that utilizes PET plastic as its base material and is manufactured using a combination of techniques including multi-layer metal sputtering, vacuum technology, nanotechnology, as well as thin-film physics and fine chemical engineering. It sandwiches heat-insulating nano-particles resin in between, endowing it with high thermal insulation efficiency, high tension, high elongation, and strong resistance to acids and alkalis. Generally, soundproof films that meet quality standards, have the right thickness, and are installed correctly can provide a certain level of sound insulation. However, comparatively, the soundproofing effect of soundproof films is not as high as that of soundproof windows and can typically only reduce noise levels by 3-12 decibels, especially effective against mid to high-frequency noises. Apart from soundproofing, window soundproof films have other advantages as well, including ease of installation, cost-effectiveness, simple construction, the ability to block heat from solar radiation, prevention of hot air from entering indoors, and maintaining visibility and transparency. Therefore, it is considered a practical type of window film.