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Glass is designed to act as a barrier from exterior elements (i.e. wind, rain, and snow) while providing a natural view of the outside world. When solar energy or sunlight, comprised of heat, light and UV Rays hits an untreated window, almost 90% of the energy is transmitted through the glass.
In contrast, once a solar control window film is applied to glass nearly 80% of solar energy can be blocked. The special dyes, metals or nanotechnology within the film, act as a solar energy barrier by either absorbing or reflecting a percentage of the energy from passing through the glass.
The level of absorption and reflectance is dependent on how the film is constructed. Dyed films contain no metal and are considered non-reflective because they absorb solar energy. They are not as effective in controlling solar heat and light because they do not provide any solar reflectance. On the other hand, metalized or nanofilms provide both solar absorption and reflectance. They do a much better job of solar control since their construction properties control both heat and light from passing through the glass surface.
Consult a Johnson Window Films professional to find the best films to suit your needs.