Choosing your windows

Energy rating of thermal insulation glass improved.

Double glazing window energy efficiency can be further increased by substituting dehydrated air with an inert gas, such as argon, xenon or krypton within the unit. Argon, which has 34% lower thermal conductivity than air, is the most commonly used. Although argon-filled units cost around 5% more than air-filled units, they can improve a double glazing window’s U value or energy rating by over 30%. Argon fillings should last the lifetime of a double glazing window and over a period of 25 years should not lose more than 5%.

Krypton and Xenon are even more energy efficient than Argon but are seldom used in double glazing window as they are more expensive.

It would be interesting to provide the ratio of gas costs between Argon, Krypton and Xenon. Also it is important to note that sometimes you do have to use Krypton/Xenon limited width is available. I.e.: in old buildings for example.

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