There is the possibility on old buildings to see the classic castel (scuntion) windows carrying the signs of handcrafts of old masters by its elegance and sophistication. The scuntion window is a window with external and internal wing, between which is a scuntion. In the gap between wings could be a grid or pallet. In terms of thermal insulation, the gap is too wide between the windows, therefore there is an air circulation resulting in heat lost. The newest technologies allow us to produce castel windows bearing parameters comparable to those of eurowindows. Nowadays, scuntion windows are in the design of external wing using insulting glass and multipoint fitting while the internal wing could be in the design of historical original state – replicas.