REHVA is the Federation of European HVAC Associations and represents more than 120 000 building services engineers from 27 European countries. Our task consists in Connecting European Professionals in the area of Building Engineering Services (heating, ventilating and air-conditioning for energy efficient healthy buildings) We commit ourselves to the development and dissemination of economical, energy efficient and healthy technologies for mechanical services of buildings, to serve our members and the field of Building Engineering.