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Velux anti-dew coating - is it worth it?

Adsibob
in Skylights & Roof Windows

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I'm comparing two Velux pitched roof windows, the GGL 206821U and the GGL 206621U. 

The 206821U has "rain noise reduction", whereas the "206621U" has anti-dew and easy to clean coating and has a marginally better U-value of 1.0 vs the 206821U's 1.1 U value.

 

The anti dew apparently "reduces number of hours external condensation is present".

 

The difference is about £80. Is the anti-dew coating worth it? I have seen the thread here which concluded the self-cleaning coating is only worth it if you have a window that gets lots of sun and I am assuming that is what "easy to clean" coating means in the description of the GGL 206621U, but just wondered if anyone had any issues with veluxes and dew? I've never had a rooflight before, so not sure whether avoiding dew/external condensation is something worth spending money on.

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