To provide the current population of Bospolder - Tussendijken with a future perspective that tackles socio-demographic issues, they create Phase Change Material (PCM) Modules of waste products Frying oil and Mg2+ in the cooperative factory: 'Frituurfabriek' in the M4H. They have the opportunity to participate in society, to become owner of a factory, to earn salary and to bring back home the modules to sustain their homes. The accessible production process for this circular passive cooling element for housing renovations allows great crafts and educational development for the people. It attracts a wider public than pure the workers, since there is also a community centre, additional workshops and an extension of the BoTu neighbourhood, located on top of the factory. As a showcase this is designed as a full PCM building; no insulation but PCM ensures consistent interior climate. All together, this social concept of emancipating the population is tohave social impact by low-tech innovation, it relinks the historic M4H and BoTu relation and offers an alternative concept for architecture an (conservative) use of finite material use as sand.