The “Arborea” project in Köniz was developed by Raiffeisen Pension Fund as a sustainable rental property, with a focus on resource-efficient timber construction. To meet the strict requirements of Minergie-P-Eco, the building features a fully insulated building envelope and utilizes solar energy both passively and actively. A key component of the ecological energy concept is the increase in energy efficiency achieved through the installed Jouliashower channel, which enables efficient heat recovery directly in the bathroom. Thanks to the consistent system separation and the selection of eco-friendly materials, not only are maintenance costs reduced, but the highest standards of healthy living and sustainability are also met. The combination of cost-effective construction and innovative technology, such as the 3P Joulia gutter, makes the property a showcase project for modern, energy-efficient living.