Krypton is another noble gas that performs in a very similar way to Argon. Slightly higher in quality and more dense, it’s an extremely effective form of insulation for double and triple glazed units.

Krypton is typically used for thinner windows, where the gap between the panes is much smaller, such as heritage windows. This preserves the authentic aesthetic without compromising on thermal performance.

The only real drawback of Krypton is that it’s a much rarer gas, existing in quantities in the atmosphere of one part per million. This makes it a more expensive option and why it’s primarily used in smaller quantities.