Thanks to state of the art insulation and an innovative ventilation system, the German building - HQ for Juwi - makes all its own energy from a vast array of solar panels on the roof, walls and even car port roofs.
When the Zero Mission Project visited the building a couple of weeks ago, what really amazed them was the triple glazed windows - so efficient at stopping heat escaping to the outside, that the exterior pane had frost its outside.
Here in the UK, double glazing installers are reporting that initial customer dis-satisfaction at condensation on exterior panes of a-rated windows is turning to appreciation when homeowners learn this is a normal occurrence for such highly energy efficient rated windows.
You can read more about the latest a-rated double glazing and the cause of exterior condensation by visiting our dedicated double glazing blog - click here.
photo credit: lady dragonflycc