There are many differences between window film and curtains in terms of function and characteristics:

Thermal insulation effect:

Window film has a very good thermal insulation effect, can effectively block the sun's heat into the room, similar to the thermal insulation effect of a brick wall.

Curtains can not achieve the same thermal insulation effect, even if the curtains are drawn, the sun's heat will still enter the room through the glass.

UV protection:

Window film can isolate 99% of UV rays, protecting furniture, floors, sofas, etc. from fading and aging, as well as helping to protect the skin.

Curtains are less effective at blocking UV rays and only block some of them when drawn.

Privacy:

Window film and curtains both provide privacy protection, but curtains can't see outside when they're drawn, while window film can see outside even when it's applied.

Window film is one-way see-through, guaranteeing that the outside cannot see inside, while curtains completely block the view.

Installation and Maintenance:

The installation of window film is relatively simple, only need to stick it on and trim the corners, while the installation of curtains is more complicated, requiring a series 

of steps such as punching holes and fixing.

Curtains need to be cleaned frequently, while the shelf life of window film is about 8 years, and do not need to be cleaned frequently, normal glass scrubbing can be.

Safety:

Window film has a safety and explosion-proof function, even if the glass is broken, it will not hurt people, while curtains in this regard can not provide protection.

Curtains in the case of pulling on the case can avoid glass slag splash, but in the case of not pulling on the case can not provide protection.

Decorative:

Curtains have good decorative qualities that enhance the style and design of the entire home, whereas window film is relatively less decorative.

Economical:

Window film costs less, usually between tens of dollars, while curtains are relatively expensive and require the purchase of various accessories.

Light Management:

After the curtains are drawn, the room will become dark, while after the window film is applied, the room will still have plenty of light.

Summarize:

Window film and curtains have their own advantages and disadvantages, and which one you choose depends largely on your personal needs and preferences. 

If you emphasize on heat insulation, privacy protection and security, and want to have enough light indoors, you can choose window film. If you are more interested in 

decorative effects and the ability to completely block out light, you can choose curtains. Of course, you can also use a mix of both depending

on the function and needs of the room.