It is useful. The sunscreen film can reduce air conditioning costs by 30%. This year, in order to spend a cool summer, I stick the film in my house and it effectively insulate the house from heat. The outdoor temperature now is 35 degrees, and that in home is only 30 degrees, making the home very comfortable.
The curtains are suggested as they are more practical. The curtain is convenient as it can deal with such problems as ventilation and light shading. Although it can shade the light and do not occupy space, the film is not decorative.
