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Exterior shades change the comparison with smart tint
Exterior solar shades seem like they could have a real advantage over tint applied at the glass: they can intercept sun before it heats the glazing. But is that a meaningful cooling benefit in practice, or does it depend so much on the window and exposure that there’s no general answer?
I’d expect the distinction to matter most on sun-exposed windows, while shaded ones may have less solar heat to manage in the first place. Smart tint also has a different appeal if keeping daylight and the view matters; an exterior shade changes what you see through the window, and its performance depends on how it’s operated.
What would you compare to make this an apples-to-apples decision? I’m thinking SHGC and visible transmittance for the actual glazing or film, alongside performance data for the shade, rather than relying on a broad claim that either option cuts cooling costs.
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One wrinkle in comparing the numbers: the SHGC for bare glazing doesn’t capture what an exterior shade does. For the shade option, look for solar heat-gain data rated for the window-and-shade assembly, not just the shade’s standalone spec, and compare that with the glazing or film SHGC. That gives a more relevant estimate of solar gain through the treated window. If the manufacturer doesn’t provide compatible assembly data, the figures may not be apples-to-apples.