The Drøbak Montessori School in Norway is designed to produce more renewable energy than it uses, focusing on effective ventilation for thermal comfort and indoor air quality. The school uses a unique system with tall rooms and displacement ventilation, switching between mechanical and hybrid ventilation based on the season. Heating and cooling are provided solely through the ventilation system, with no additional heating sources. The system adjusts air temperature and flow based on indoor and outdoor conditions, ensuring a comfortable indoor climate. Through simulations, laboratory tests, and field measurements, the system was found to provide satisfactory thermal comfort and air quality.