The primary school in Frankfurt-Riedberg is one of the first schools in Germany to be built entirely using the Passive House construction method. Certificated by the Passive House Institute in Darmstadt as “Quality-Proved Passive House” – in comparison with a school built using conventional methods, up to 90% of energy costs are saved. A controlled room ventilation system with highly efficient heat recovery together with economical energy consumption ensures high indoor air quality and so provides an excellent learning environment. The use of a pellet heating system, a controlled mechanical ventilation system and corresponding heat insulation ensure lower operating costs and lower CO2 emissions.