Thomas and Heike live in a passivhaus in Aachen, Germany, which maintains temperature through thermal insulation and mechanical ventilation. They use a heat pump powered by solar panels, resulting in significant energy savings. The Urban Energy Lab 4.0 at RWTH Aachen investigates future energy systems and user interactions with energy efficiency. The project, costing EUR 5.5 million, is funded by various European and German entities. Teljes cikk (Euronews.com)