PS: Is it still an “air gap” without using “noble gases” and just “air”? Thanks so much!
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The gap between multi-pane windows acts as an insulator. Here in Canada we often use triple pane – with 2 air gaps. Glass itself is a poor insulator, but air – if it is not allowed to circulate much and transfer heat via convection – is a relatively good insulator. Most insulation like down or fibreglass works by trapping small pockets of air. Similarly, by trapping a thin layer of air between window panes you can increase the insulative properties of the window.
Argon has a lower thermal conductivity than air – so technically, windows with interstitial pane gaps filled with argon should insulate better.
However, I’ve had a window manufacturer admit to me that it’s a bit of a gimmick, as after about 6 months the argon leaks out of the imperfect seals and the gap is “just air” again.
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