Smart devices are invading everyday spaces like our bedrooms and living rooms, making it possible to conduct new participatory experimentations in the ‘real world’. An example is the National Housing Monitoring Network (Red Nacional de Monitoreo, ReNaM). By installing networked sensors in homes in different cities in Chile, ReNaM seeks to generate a large public database on the environmental behaviour of homes in real life conditions and throughout their life cycle, in order to make data-driven policies and regulations on sustainable building. In this article, we argue that experiments with digital innovations like ReNaM are moving towards a ‘sensor governmentality’ or a mode of sensitive regulation of household behaviour at a distance, recomposing the relationship that the State establishes with its population. However, we find that this sensor governmentality is multivalent, fragile and friction-loaded. We analyse different scripts present in ReNaM and the frictions that emerge between divergent ways of materialising this sensor network from above and below. Moreover, the real environmental conditions and behaviours that the experiment seeks to capture through sensors are always challenged by the multiple entanglements that sensor devices unfold in domestic spaces, suggesting that affective and collective possibilities in these real-world experiments should be considered.