What gas is used in double glazing?

17 June 2022

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At this time, double glazing is widely recognised around the globe for being created especially to insulate our houses and keep us warm throughout the winter. Double glazing allows us to switch off our heating sooner and leave it off for longer since it keeps the heat inside the house for a longer period of time. Each of us eventually saves a significant amount on our annual energy bills as a result of this. It also helps us to reduce our carbon footprints, which is crucial given how the present global climate catastrophe is hurting people everywhere.

Double glazing: What is it?

In order to keep the two glass panes apart from one another and offer an additional layer of insulation to the installation, double glazing is composed of two panes of glass that are spaced between by a layer of air or gas. The pane is then sealed to prevent moisture infiltration and leakage of the air/gas pocket. If a leak has formed anywhere along the seal, you'll notice that the inside of the glass has begun to mist up or fog. The window is deemed to have been blown if this is the case. It would be great if you thought about getting the seal fixed or getting the window replaced totally because it isn't functioning well as insulation.

What choices are there?

Depending on the window, different gases are utilised in between them. The primary choices are:

  • Dehydrated air
  • Xenon
  • Krypton
  • Argon

Comparing one choice to the others reveals its own advantages and disadvantages.

Dehydrated air

When double glazing first entered the market in the 1970s and continued to be widely used until the 1990s, dehydrated air was the most prevalent of all. Although it is reasonably inexpensive when compared to the other choices, its insulating capabilities decrease greatly. Due to the absence of water vapour, dehydrated air acts as a greater insulator than normal air. To today's standards, it is still not very effective at insulating.


Due to its excellent insulating qualities and affordable price compared to the other two inert gases, argon is the most popular choice of the four today. Argon is a chemical that is colourless and odourless, denser than air, and works well as a heat insulator. Most double glazing systems may, at a relatively modest cost, use argon to fulfil the Building Regulations' requirements for energy efficiency. Although it doesn't provide the greatest insulation of the three, it is undoubtedly the most often used and least expensive option.


In terms of insulation and price among the three inert gases, Krypton lies in the centre. Krypton, which is denser than argon and air, offers great insulation but is significantly more expensive. Due to its cheap price, argon is the prefered insulating gas for most manufacturers, therefore krypton would need to be ordered specifically. The finest alternative for smaller houses that fit their budget is krypton since they won't need the best insulation to keep their homes warm.


The most costly gas with the highest density is xenon. Due to its expensive price and the fact that argon and krypton can perform the same function for less money, xenon is relatively seldom used in household windows. Using xenon as the insulating gas will help very big structures with wide open spaces. Anything less would be overpaying, however.

What gas will work best for my double glazing?

The use of argon gas will provide appropriate insulation for the overwhelming majority of dwellings. It will keep your house warm throughout the winter and help you save money on energy costs because of its cheap cost and strong insulation qualities. Krypton is a fantastic alternative for those with a little additional money to invest since it offers superior insulation and significantly lowers your energy expenditures. Only those seeking double glazing for really big rooms and buildings should actually utilise xenon.


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