The establishment of the Tropenhaus Klein-Eden in Kleintettau in Bavaria, Germany, is supported by us with our years of experience with integrated polyculture systems as agricultural production units (see also Tropenhaus Wolhusen). Tropical houses are a reference for the energy efficient use of waste heat in the low temperature range, and are also suited for research and culture of subtropical and tropical fruits and edible freshwater fish in organic quality in climatically rather harsh regions.