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I understand that mirror/reflective film works by having metallic components that reflect infrared energy back outside. However for ceramic window film it is usually described as absorbing or "rejecting" the heat. How does that actually work? What does "rejection" mean in physical terms?

Doesn't that mean the film will simply get hotter as it absorbs the heat, which will then heat up the indoor air next to it?

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  • presumably, reject = reflect, otherwise it wouldn't do much good. Heat cannot be destroyed, according to Newton.
    – dandavis
    Aug 15, 2021 at 15:04

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