This dataset has been collected in context of the domOS H2020 project (https://www.domos-project.eu/). The dataset includes data about 147 family homes of which 144 are flats in 12 building blocks and the rest are single family buildings. All buildings are owned by a building association, and are heated via the local district heating company. The buildings have been renovated and are now prepared for low temperature district heating. Within the area, new private homes (mostly blocks and flats) are being built or renovated. The District heating supply to the 12 building blocks is supplied from a local mixing loop separating the district heating transmission from the local distribution. The heating installations in each block can be controlled as well as the mixing loop to the area. Energy and indoor climate data is supplied from selected apartments and from each heating central. The district heating to the 3 single family buildings is not supplied with district heating from the local mixing loop, but from the transmission line directly. In each building, datalogging and control on the heating installation are possible. Furthermore, data from indoor climate sensors as well as sensors on doors and windows is available. The ongoing data collection has been started in several steps. On the three single family houses, data collection started in February 2020. For the apartment buildings data collection began in June 2021 and for the central mixing loop it began in march 2022.