This paper traces the spatiotemporal rhythms and ruptures of summer heat for energy vulnerable households in southern Australia. It argues that richer accounts and understanding of these spatiotemporal dimensions of summer heat as they intersect with energy justice and climate change adaptation are important to more nuanced views of the energy, housing, environmental and ecological justice dimensions of home. The paper draws on empirical research with vulnerable households in an urban and regional case study in Victoria, Australia. Grounded in this data, it brings together relational post-human theories and phenomenological ideas about the body and time to emphasise the temporal dissonance of summer heat experiences. Temporal dissonance, defined as the disjuncture or rupture to embodied rhythms of place, is shown to play out within multiple spatiotemporal trajectories. The research reveals entangled rhythmic practices of people and sociomaterial environments that work to cope, adapt or just endure summer heat events. It stresses the significance not only of rhythms of heat and household responses, but also of the temporal narratives of heat, that when out-of-sink with rhythmic responses to heat events risk stabilising vulnerable households in maladaptive situations. The findings suggest the need for the governance of summer heat adaptation, particularly as it intersects with household thermal quality, to pay greater attention to the temporal relations between human and more-than-human worlds of home and homemaking.