School sets good example on retrofitting.

Grilningen primary school near Zurich, Switzerland, was built 20 years ago, and energy consumption, in particular for heating and lighting, was unnecessarily high. An unconventional retrofitting procedure involving new chip-wood furnace, interior insulation, mass-coupled ventilation and controlled artificial lighting was adopted. The work was carried out without interruption of normal school operation. The results are very promising and measurements indicate a drop in heat consumption of 70% with standards of comfort raised considerably. Incurred costs proved quite reasonable compared to those of other retrofitting techniques.