ᐅ Triple glazing with or without gas fill

Hi everyone,
regardless of the U-value of the windows, how do you see the pros and cons of gas filling in windows? My general contractor tells me horror stories about gas filling: cloudy or milky appearance and very expensive.
Is there any truth to that?

Modern windows always have gas inside anyway! We use argon. What does your general contractor say?

If the gas escapes, moisture would be drawn inside and cause the window to become foggy.
I have seen that krypton and xenon are significantly more expensive than argon.

Krypton glass is more suitable for passive houses, as it has significantly lower thermal conductivity than argon. Xenon is similar (but provides even better insulation) and is even more expensive. As far as I know, argon is the standard today. Are there still windows available without gas filling?

I would definitely request the datasheet for the window panes regardless of the gas filling.
This should include not only the U-value but also the G-value (solar energy transmittance = how much the sun heats the house) and the light transmission (how much LIGHT still reaches the room; modern triple glazing has about 70% and double glazing about 80%)—all important!

I have never heard of any gas leakage causing the glass to become cloudy.
However, it is often mentioned that with triple glazing the outer panes can fog up.

WildThing schrieb:

It is often said that with triple glazing the window panes can fog up on the outside.

This is not a myth! Especially in autumn (so right now) and spring, the exterior panes fog up EXTREMELY. Humidity in the air condenses on cold surfaces. With highly insulated glass, the cold surfaces are the outer panes. Sometimes it's almost impossible to see through the windows because of how much they are fogged. However, this happens in nearly every house in our neighborhood.