Solar Control Film and Health: Reducing UV Exposure Indoors

Glass keeps the weather out, but it does not keep all of the sun out. If you spend your working day beside a window, or your office has a lot of large glass panes, you are taking in ultraviolet (UV) radiation even when you never step outside. Solar control film is one practical way to reduce that exposure, and it raises a question we hear often: does UV window film reduce heat as well? Below we look at how much UV passes through glass and what that means for health, then at what film can and cannot do.

What UV Exposure Indoors Means for Health

Cancer Council Australia notes that both episodic and cumulative UV exposure are associated with an increased risk of skin cancer. The word cumulative matters here. A few minutes of UVA through a window is small on its own, but it adds up for people who sit in the same spot for years, such as office workers at a window desk, receptionists, teachers and anyone who works in a sunroom.

It helps to keep the risk in proportion. Cancer Council's guidance is that sun exposure risk is low indoors and that sunscreen is generally unnecessary inside. For people who spend long periods directly beside a sunlit window, clothing may be enough. The main sun protection work still happens outdoors.

Reducing the UV that reaches you indoors is a sensible extra layer of protection.

How Solar Control Film Reduces UV Exposure

Quality solar control films typically block around 99 per cent of UV radiation, and the exact figure is listed on each film's datasheet. Cancer Council Australia's guidance on tinted windows also notes that clear or tinted films can reduce the total UV passing through glass by more than 99 per cent.

That performance comes from UV absorbers built into the film, so it does not depend on how dark the film looks. A light, low reflectivity film can block as much UV as a darker reflective one.

At All Film Solutions we supply four main types of solar control film: dual reflective, silver reflective, low reflectivity and spectrally selective. Each suits a different look and light level, and each reduces UV alongside heat and glare. Most solar control film is applied to the inside face of the glass, so once it is installed correctly the benefit covers the whole pane.

Does UV Window Film Reduce Heat?

Not on its own. UV makes up only a small fraction of the solar energy that reaches a building. Most of the heat you feel comes from visible light and infrared radiation, and a film that targets UV alone leaves those largely untouched.

Solar control film is different because it is built to reject heat as well. Reflective solar films turn away a meaningful share of solar energy before it warms the room, which is why they are a common choice for hot offices and large glass panes in a community spaces.

So when people ask whether UV film for windows reduces heat, the accurate answer is that a UV-only film does little, while a dual reflective, low reflective and external solar control film does both jobs: it cuts UV and it brings the temperature down. The product datasheet lists UV rejection and total solar energy rejection separately, so it is worth checking both figures before you decide.

Where Reducing UV Indoors Matters Most

Film earns its place where people sit in sunlight for long stretches. That includes open-plan offices with desks along the glass line, reception areas, classrooms, waiting rooms in medical and aged care settings.

The same film also protects carpets, furniture and artwork  from UV fading.

Frequently Asked Questions

Does window film block all UV rays?

No film blocks literally everything, but quality solar control film blocks around 99 per cent of UV. The exact figure is on the datasheet for each film.

Will UV film make my rooms darker?

Not necessarily. Low reflectivity and spectrally selective films are designed to keep natural light high while reducing UV and heat. Visible light transmission varies by film, so ask for the VLT figure.

Can solar control film be applied to double-glazed windows?

Often it can, but the glass needs to be assessed first. Film installers check glass type, thickness and framing before recommending a film, because some combinations carry a risk of thermal stress.

Talk to All Film Solutions About UV and Heat Control

If you would like to reduce UV and heat in your office, school, shopfront or home, the team at All Film Solutions can assess your glass and recommend the right film. Explore our solar control window film range or call (03) 9789 4455 to arrange a quote.