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New methods for designing with phase change materials (PCM) could widen the range of applications of passive systems for indoor cooling in architecture. This paper investigates material and formal strategies for generative architectural design that support the thermal performance of PCM. Dendritic geometry of PCM encapsulation with a large surface area per unit volume is proposed for enhancement of the heat transfer between PCM and surroundings. The prototype of the PCM ceiling component is digitally designed, manufactured in glass and tested in an experimental set-up for thermal cycling. Correlations are made between geometric configurations and cooling performance of dendritic and spherical PCM containments. The presented methodology integrates tools and techniques from digital design and energy technology, with an aim to contribute to novel PCM-based concepts for local thermal regulation in architecture.