Passivhaus is a rigorous, voluntary standard for energy efficiency in buildings. It was developed in Germany in the 1990s and has since been adopted globally. The standard focuses on reducing a building’s energy consumption through passive means, such as high insulation values, airtight construction, and energy-efficient windows. This results in buildings that require minimal heating and cooling, even in extreme weather conditions. The ultimate goal of Passivhaus is to create buildings that use very little energy, resulting in reduced carbon emissions and lower energy costs for building occupants. To meet the Passivhaus standard, a building must undergo extensive testing and verification to ensure that it meets strict energy performance criteria.