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Double glazed windows wouldn’t be the same without the air filled inside its panes. It is one of those things that make double glazed windows famous and effective. But have you even though of the effect of gases being locked up inside your windows? Or have you considered the possible changes that might happen when you substitute the air with a different kind of gas?



Generally, air is a good insulator of electricity and heat. Why is that so? Since the particles of air are very far apart, it will take a long time for air molecules to bump from one another to distribute heat energy. The air contained between the two glass panes of your window help stop heat from escaping when a certain kind of air is used. It’s also preferred as an additional insulator because it doesn’t obstruct the view of your window since air is transparent. Such common gases used for double glazed windows are dehydrated air, argon, krypton, and xenon.   


Different Types of Gases Used for Double Glazed Windows


In the double glazing industry, there are 4 kinds of gases used: dehydrated air, krypton, argon, and xenon. Each has their features and some of these are preferred than the other. So if you can’t add the number of panes on your window, then you can try having double glazed windows with a different kind of air inside it.


Dehydrated air


What is dehydrated air? In a nutshell, dehydrated air is air without any moisture in it. You can also call it, dry air. When moisture is removed from air, the air becomes less dense with lesser particles so its particles go farther apart. Because of this composition, dehydrated air will conduct less heat and thus provide higher insulating capacity, lower thermal conductivity, and high heat resistance. Its particle composition is also the reason why it can improve sound insulation.




Dehydrated gas, however, has a better alternative - inert gas. One type of inert gas commonly used in double glazed windows is argon. Argon is an inert gas which means it does not react to most chemical reactions. It is not toxic, corrosive, explosive, or even flammable.


Argon has 34% lower thermal conductivity and can increase the U value of double glazed windows by 30 per cent. However, this would cost 5 per cent more than air filled used. Argon filled windows should last for more 25 years and lose only about 5% of its original amount throughout its lifetime on a double glazed window.


Krypton and Xenon


The other two kinds of gases, Krypton and Xenon are more energy efficient that Argon. They are, however, less commonly used on double glazed windows since they would cost more. Krypton is commonly used on triple glazed windows.

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