REHVA is the Federation of European Heating, Ventilating and Air-conditioning Associations. It represents 100 000 experts in building services engineering in 28 European countries. REHVA is the leading professional organization in Europe dedicated to the improvement of health, comfort and energy efficiency in all buildings and communities. It encourages the development and application of both energy conservation and renewable energy sources. In these areas, REHVA has a significant impact on national and international strategic planning and research initiatives as well as on the associated educational and training programmes.