A historic building in Zurich is employing an unconventional cooling method, utilizing its heating system with 20-degree Celsius water circulated through convection radiators. This innovative approach allows the building to maintain comfortable temperatures without relying on traditional, energy-intensive air conditioning units. The system effectively leverages the building’s existing infrastructure, demonstrating a sustainable alternative to conventional cooling technologies. By using the heating system in reverse, the building absorbs heat and provides a cooling effect. This method is gaining attention as a potential solution for energy-efficient temperature regulation in older buildings. The project highlights a move towards more resourceful and environmentally friendly building practices within the city of Zurich.