Improving the energy efficiency of buildings is a necessary step towards a low-carbon society. In the Danish residential sector, increasingly ambitious building standards are leading to the spread of new and retrofitted dwellings built on the same model: heavy facades with high levels of insulation, hydronic underfloor heating embedded in a concrete slab, and mechanical ventilation with heat recovery, often partly or fully automated. This model is becoming standard practice in most new development projects; however, little is known about the way occupants experience and use such dwellings – and in particular the new technical installations. Research works in several countries have demonstrated that low-energy dwellings consume on average more energy than predicted. Moreover, post-occupancy evaluations highlighted a number of issues related to the technical installations in such dwellings with negative consequences on occupant satisfaction. The first objective of this project was to understand the advantages and shortcomings of heating and mechanical ventilation systems in low-energy homes, seen from the point of view of occupants. To do so, occupant comfort and satisfaction in dwellings were approached with an interdisciplinary toolset. A field study consisting of a survey and semi-structured interviews permitted to gather insights on occupants’ preferences, opinions and behaviours. The interviews were carried out in collaboration with social scientists. The second objective was to contribute to the development of solutions to the issues highlighted in the field study. This was first done by identifying some personal and contextual factors that impacted occupant satisfaction and should be taken into consideration in building design and operation. Finally, a data-driven tool to automatically detect faults and inefficiencies on heating installations was built and demonstrated on a test apartment. The field study revealed that, while indoor environmental quality was overall considered satisfactory, the technical ...