The Dutch Care Federation (Nederlandse Zorgfederatie) signed an agreement with the Dutch Department for Economy to reduce the energy consumption for 30% related to the level of 1988. The newly to built Deventer Hospital which will be finished in 2006 offers a chance to implement this plan. Beside the strong focus on energy efficiency the new building design is strongly dedicated to the comfort and well-being of the patients as well as employees and other user-groups. The project aims to reach energy efficiency by an integrated approach including building, installations and constructions. Energy efficiency shall be higher than in average new Dutch hospitals. Already during the planning, design and building process user needs and wishes shall be regarded. The energy concept aims to realise a good balance between energy efficiency and health, respectively comfort issues. To enlarge the building’s lifetime it is aimed to realise a flexible climatic system, which allows fast and cost efficient adaptation to new functions, free arrangement of rooms and individual regulation of local temperature. The innovative energy system combines a low temperature system for the gene- ration of heat with a high temperature system for the generation of hot tap water, which need to be kept on a high temperature to prevent legionella. The standard demand of heat and cold is supplied by an energy efficient heat pump, which covers about 50% of the total thermal capacity. Only for the peak loads (ca. 30% of the total capacity) conventional boilers are used. Remaining heat and cold from the system is buffered in a heat-buffering layer of sand in the ground of the hospital. The buffered warm/cold is used for pre-warming or pre-cooling. The heat/cold is distributed via the ventilation air (“all air concept “). Instead of radiators energy efficient low distance heaters and regulations flaps are applied. The heating ventilation system is therefore a highly efficient and flexible system enabling free arrangement and adaptation of rooms. Flexibility of making joints to the façade enables flexibility in using the floors of the hospital. There are no installation elements near the façade. Sustainable choice of materials shall be key input for the design phase. The façade shall be developed so as to make maximum use of daylighting, and to have a very good thermal insulation. Copyright 2005 All rights reserved. Supported by the European Commission.