There is a smarter choice than window replacement

We upgrade your double-glass window to triple-glass to 60% lower cost compared to a window replacement. Our unique installation of the ClimateGlass is done fast and smooth from the inside. All you have to do is move the couch or desk a bit away from the window.

Grundels ClimateGlass for all type of buildings

  • Up to 70% cheaper compared to window replacements
  • Up to 30% lower energy consumption
  • More than 50% lower noise
  • Reduced cold or warm drafts
  • Made in Sweden

Fast and smooth installation. From the inside.

  • N
    o scaffolding
  • No changes to the external aesthetics
  • Free from dust
  • 30 min installation time per window
  • 10 year warranty

Do not change windows – Upgrade instead.
For the indoor- and the outdoor environment

For 27 years we have upgraded more than 500 000 windows. Windows that otherwise would have been replaced by new and thrown away as waste. There is now a smarter option to window replacement that reduce energy consumption, noise from the outside and eliminates cold or warm drafts. We upgrade your existing double-glass window with a site-built ClimateGlass. The result is a three-glass window, heurmetical sealed with the same insulating properties as a new window. But up to 70% lower cost compared to a new window. Our unique installation is fast and smooth and all done from the inside. All you have to do is move the couch or desk a bit away from the window. As mentioned – a smarter option.

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How it works


Cheaper compared to window replacement
Reduced noise
10 years
Reduced energy consumption
Reduced cold or warm draft
30 min
Installation time per window

Before & after

Se hur det ser ut innan klimatrutan monteras


Grundels ClimateGlass can be mounted on all types of windows. Bars or hand-blown glass is not a problem. With our unique mounting technique we make the ClimateGlass 100% heurmetic sealed.
Resultatet efter montering av Grundels Klimatruta


The result should not be seen. It should be felt. After we have sealed the ClimateGlass we finish it all off with a wooden frame or silicone string in the same color as the window.

Frequently asked questions (Faq)

Which energy value will I get after the upgrade?
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The energy value (-U-value) will be reduced from ~2,9W/m2 to 1.3W/m2. Approx. An energy saving of 20%.

How do you mount the ClimateGlass?
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We mount ClimateGlass in the inner glass of your existing windows.

What preparations do we need to make before you upgrade our windows with the ClimateGlass?
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You do not need to do a lot, just remove any flowers, curtains that might be placed in the window and move the couch or desk a bit away from the window.

What is included in the installation of the ClimateGlass?
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A full installation package – material, mounting and all the advantages as well as 10 years warranty.