The box in which the shades are rolled up is probably not isolated. That’s a pretty common thing in older houses and you lose a lot of heat through there.
You can open it and isolate it yourself, search for “Rolladenkasten isolieren” . You might need to repaint that area, depending on how easy it is to open the box
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The box in which the shades are rolled up is probably not isolated. That’s a pretty common thing in older houses and you lose a lot of heat through there.
You can open it and isolate it yourself, search for “Rolladenkasten isolieren” . You might need to repaint that area, depending on how easy it is to open the box
https://teso-shop.de/rolladenzubehoer/gurtfuehrung/167/diha-esm-sanierungsgurtfuehrung-ohne-gurtausbau?gad_source=1&gclid=EAIaIQobChMIyv3XiJO-iAMVialoCR2VFi6yEAQYAyABEgKWE_D_BwE