Researching IoT through Design is a proposal for reworking how one might approach ubiquitous networked things or loT, that no longer have stable and predictable uses - and to be-at-home with them in everyday life. This inquiry into being-at-home entails a shift from the idea of the home as a fixed, four-walled space for everyday routine separate from the outside world. It is instead replaced by a notion of the home as needing to be constantly re-sensitised and refamiliarised to the wider world in which it is embedded. The author argues the importance of securing a space for sensitisation, which forms the grounding of this study's focus on participation, and the importance of referring to such spaces as 'design'. The author shows how delving into diverse participatory approaches in IoT can make clear the conditions under which being-at-home can be explored. Derived from the practice of Research through Design, the notion of being-at-home is examined through critically oriented design experimentation. It includes theoretical and methodological trajectories for 'doing' design, building on design anthropology, feminist technoscience, and post human discourses. The design experiments a re conducted in three distinct design contexts, where each context gravitates towards one or more participatory approaches in loT. Together, these experiments call into consideration the need for re-familiarising things as a way to reclaim the design space that has been lost to loT's optimising logics and values.