The demo site in Frederikshavn is a three-storey social housing apartment block with 58 apartments located in the area of Munkeparken in Denmark. Pre-monitoring took place from November 2020 until May 2021. ReCO2ST project technologies of Vacuum Insulation Panels, smart windows with Phase Changing Materials and nature-based solutions are being integrated since June 2021. The post-monitoring phase involving measurements of indoor temperature, RH and CO2 will start immediately after the integration of technologies has finished.