This study is an outcome of Elforsk, project number 344-060, Bæredygtige Energi-Plus huse (Sustainable plus-energy houses).The focus of this report is to document the approach and the results of different analyses concerning a plus-energy, single family house. The house was designed for an international student competition, Solar Decathlon Europe 2012 and after the competition it was used as a full-scale experimental facility for one year. During this period, different heating and cooling strategies were tested and the performance of the house regarding the thermal indoor environment and energy was monitored.This report is structured as follows. Chapter 1 presents the project and briefly explains the different phases of the project. The details of the house’s construction and its HVAC system are explained in Chapter 2, along with the energy efficiency measures and innovations. Chapter 3 introduces the investigations carried out in detail, with respect to different phases of the project. The investigations presented are divided into four phases: design phase and pre-competition period, competition period, year-round measurements in Denmark, and improvement suggestions for building and HVAC system. The results of the investigations, measurements, and the experiences from one year of operation are presented in Chapter 4. Chapter 5 presents the main conclusions derived from the project and Chapter 6 presents a look into future research. In Appendix A, all publications and dissemination activities over the course of the project are presented. In Appendix B, the measured parameters and the measuring equipment are given.