Is it useful to stick a thermal insulation film on the glass? Who can say it?

According to research, the window film does have heat insulation effect, and it can also block more than 95% of ultraviolet rays, reducing the harm of ultraviolet rays to household items and skin while insulating heat. But the heat insulation effect of window film is only an improvement on the original basis. The use of window film does not mean that air conditioning is not needed, and the room is particularly cool. But after use, the skin is no longer hot and sad, the air conditioning temperature can be raised, and the use time can be reduced, thus reducing energy consumption. From the point of view of heat insulation effect, the larger the glass area, the better the effect, and the effect of glass curtain wall after pasting film will definitely be stronger than that of household use.