Solar window film: when it pays off and when it doesn’t

In summer the air stands still in the meeting room, the shop window display fades, and in the living room you can no longer see the TV in the afternoon. Often the answer is not a new set of blinds, but the glass itself: a solar window film.

What a solar window film does

The film is a thin coated layer applied directly to the pane. Depending on the type, it reflects a large share of the sun’s energy before it heats the room. At the same time it blocks practically all UV light – the part of sunlight that fades wood, fabrics, pictures and goods. The view stays, and so does the light.

Where it pays off most

Where it reaches its limits

A film does not replace an external blind when maximum cooling is the goal. What is shaded outside never reaches the glass. On the other hand, the film is always there, needs no protection from wind or hail and can never be forgotten. In many rooms the combination works best: film against UV and glare, blinds for the hottest hours.

The film plays its part in winter too. Modern films let in enough daylight, and some types also help keep heat in the room. Which film fits depends on orientation, glazing and use – we work that out on site.

What we check before fitting

Not every film suits every pane. On double glazing we check that the film will not make the glass heat up too much, because stress in the glass can otherwise cause cracks. Film manufacturers publish approvals for this, and we follow them. In rented flats and in condominium ownership, a quick look at the building management’s rules is worthwhile, especially for films that are visible from outside.

The mirror effect matters as well: many solar films reflect during the day when seen from outside and so offer some privacy. In the evening, when it is brighter inside than outside, this reverses. Anyone who wants real privacy around the clock combines it with a frosted film.

Fitting in practice

We clean every pane thoroughly, cut the film to size and apply it wet, without bubbles. An office with a handful of windows is usually done in a day, a flat often in a few hours. During the first weeks the film dries out completely. Small streaks disappear by themselves in that time, and until then the windows should not be cleaned.

Conclusion

A solar window film is the fastest way to make a room cooler, free of glare and kinder to furniture and goods – without building work and without losing the view. We show you samples right on your window, so you can see how the room will feel.