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Originally Posted by BloodFetish
I have the same problem as the OP. Looked into window films but was worried about heat buildup between the window panes cracking the glass. Is this a myth?
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The coatings are essentially just changing the emissivity of the window to infrared radiation by reflecting it, while allowing visible light through. There shouldn't really be any heat buildup beyond whatever is normal for the glass, as the outer pane(s) wouldn't have the coating, allowing the reflected infrared radiation out.