Triple glazing worth it

ThisIsWeird

ComicGeek said:

ThisIsWeird said:

ComicGeek said:

ThisIsWeird said:

Looking through 5 layers of glass this very second, it just doesn't occur to me that the light level or translucency is affected at all. 

EssexExile said:

ThisIsWeird said:

Looking through 5 layers of glass this very second, it just doesn't occur to me that the light level or translucency is affected at all. 

And I've just opened my triple glazed window, I can see no difference in light level looking through the glass or around it.

So with the window open, you really can't see a difference in colour tone through the glass when compared to the open view? It makes colours appear a little darker when viewed through the glass, perhaps some people are just more aware, it's very obvious to me. It doesn't make it fuzzy or less translucent, just makes the colours slightly darker.

I've also been in buildings where there is different glass on different elevations, and you can clearly see the difference from inside.

Will there be a difference that you can detect by comparing and open and a closed door or window? I'd suggest surely 'yes'. (Mind you, if the glass is at an angle to the viewing line, that's likely to have a greater effect, with reflections and stuff).
But I'm talking about everyday visibility. Am I aware that there's glass there? No. Sometimes I've even wondered if the doors have been opened by someone. It is just never an issue that you look through the three, or even five, sheets of glass and consider there's a reduction in clarity, light or visibility.
It just doesn't figure. 

I get what you're saying, but you would notice when you have to put the lights on more, or the heating on more, after changing the glazing, due to the lower g-value and light transmission. Some people compensate for that by installing bigger and bigger windows/doors, but that also massively increases room heating loads.

When we do calculations for energy usage in new build
houses a double glazed window with high g-value and light transmission has a lower annual energy profile than a triple glazed window with lower g-value and lower light transmission, even if the U-value (heat loss) is much better. Just pointing out to the OP that you can't look at one value in isolation, and that in some (many?) cases spending the extra money on triple glazing will actually increase annual energy requirements, so a double hit in the wrong direction.

Cool. Very interesting stuff.