Heat Rejection Films: Do They Live Up to the Hype?

February 3, 2025

Does your home or workplace feel like a furnace during the hot, summer months? Don’t let this summer boil you inside your safe haven. Choose the best heat-rejection window film to stay cool while letting the natural light in. In this blog, we will explore the science behind heat rejection window films, uncovering if they are just a summertime trend or a miraculous solution to make a space truly comfortable.

Do You Really Need Heat Rejection Films?

We know that your sanctuary may become a furnace due to the intense summer heat. Now let’s learn what are the heat-rejection window films and the science underlying their cooling properties.

These are thin sheets that are applied directly to your windows to reduce the heat entering the space. They are also known as sun-control films or solar-control films. With their advanced technology, they function as a shield that prevents heat gain.

Why Do Conventional Windows Fail to Keep Up with the Sun’s Heat Gain?

Do you know what type of sunlight enters through your windows? Visible light, ultraviolet light, and invisible infrared (IR) radiation are the three forms of energy penetrating your windows. Visible light allows the human eye to see objects, while UV rays cause color to fade and infrared energy produces heat. The majority of sunlight, including significant amounts of UV and infrared radiation, can flow through traditional glass, making the interior warmer and harmful for the occupants.

How Heat Rejection Films Block the Dangerous Heat

Heat-rejection window films can act as your thermal protectors in hot summer months.

Targeted Filtering: The nanoparticles in the heat rejection films function as a filter. They effectively keep your space bright by letting through the majority of visible light while drastically lowering the amount of infrared radiation that enters.

Sunlight Absorption: To give you the most comfort during the hot summer months, some heat rejection films go a step further. They absorb some of the infrared heat in addition to filtering it. In order to minimize the indoor temperature, this absorbed heat is then progressively released back outdoors.

With this, you get a cool, more energy-efficient space. By blocking solar heat most effectively, heat rejection films can take your comfort to the next level. Studies suggest a heat rejection window film can reduce the indoor temperature by 5-10 degrees Fahrenheit. This creates a noticeably cooler environment, resulting in more productive workers as well as increased profits for commercial space.

In addition to this, with less dependence on air conditioning to deal with the heat, your energy consumption decreases. This means reduced energy bills, and significant cost savings throughout the summer months.

Choose the Right Heat Rejection Film for Your Space

Your climate can affect how efficient heat rejection films are. So when choosing a heat-rejection window film, make sure to consider the climate in your space.

If you are in hot and sunny climates, choose films with a high TSER value and a low Solar Heat Gain Coefficient (SHGC) as this demonstrates how well the coating blocks solar heat gain.

For moderate climates, films with a balanced TSER and Visible Light Transmission (VLT) rate may be better. The amount of visible light that is permitted through is indicated by VLT. This keeps the heat under control and guarantees enough natural light.

So are you ready to reduce heat in your space and save energy? Get in touch with experts at L.A. Window Films to explore options that will best suit your needs.

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