Abstract: A casement frame for a window formed of a plastic section having a seat region for receiving an edge region of a window pane and a room-side casement region, and at least one heat conducting insert arranged in the plastic section and forming a thermal bridge between the casement and seat regions of the plastic section for conducting room heat to the edge region of the window pane. The plastic section is formed with chambers arranged along its cross section. The heat conducting insert being located in an innermost, or room adjacent, chamber with the heat transfer taking place inside the innermost chamber and the remaining chambers serving as heat insulating chambers.