With its tidy perforated façade, upright window formats and circumferential frames reminiscent of Berlin’s Wilhelminian buildings, the administration building has stood in Berlin Tempelhof since 2021. For the heating and cooling concept of the five-storey office building, the architects used the thermal storage mass of the exterior walls and storey ceilings and optimised the proportion of glazing to reduce heat loss. The windows, which are flush with the exterior façade on the inside, are shaded by the deep reveals when the summer sun is high in the sky. This makes external sun protection almost entirely unnecessary. Night cooling is used via central atriums.
The building only needs to be heated or cooled a few days a year. “The storage capacity of the bricks lasts up to three months. If the wall can still absorb warmth in late autumn, it will last until February,” explains Gerd Jäger. Underfloor heating – supplied by a reversible heat pump in conjunction with a photovoltaic system – can be switched on as required.