Our first Passivhaus project was built in NZ in 2011/12. This project was a pioneer for the Waikato region, and the clients were, and still are, passionate ambassadors for this type of housing. The project was well-planned, managed and built, however were the results going to align with what our software and experience were telling us? We needed verification, and the best way we can do this is to install temperate sensors throughout the home and monitor the performance over several seasons and years. We were very lucky that the owners of the home were skilled in this area and a system was installed to monitor the temperate throughout several rooms within the home, under the ground and outside the home. This provided us with an extensive amount of data to use. It provided us with a clearer understanding of what we had designed, it provided us with learning opportunities and most importantly it provided us with the ability to understand how Passivhaus worked within the New Zealand climate, which is different to where it originated in central Europe.