Simple functional definition of a Passivhaus, which doesn’t refer to any numerical value and which is climate independent is: “A Passivhaus building is a building, for which thermal comfort (ISO 7730) can be achieved solely by post-heating or post-cooling of the fresh air mass, which is required to achieve sufficient indoor air quality conditions – without the need for additional recirculation of air.” Passivhaus is not a brand name, but a construction concept that can be applied by anyone and that has stood the test of practice.
Passivhuas criteria are exact and unbiased, they are a product of integration of science and architecture, but also a product of a stringent and demanding verification process of building’s design and construction solution. What differs Passivhaus from other green certifications, is the functional definition. Passivhaus is not a descriptive standard. Just as an example, one of the criteria, criteria for maximum annual heating and/or cooling demand, numerically described as 15 kWh/(m2a) is just a rough benchmark and of course it varies in different climate conditions.
-Passivhaus criteria for heating and/ or cooling demand, 15 kWh/(m2a),  is not a fixed figure criteria?
-Of course not!
-Now I really want to know more!
-Yes, there is much more to find out!
-Exactly this is where the SEEDpass project begins


Based on the best of our knowledge, there are over 50,000 (residential and non-residential) passivhaus living units worldwide currently (one unit equals 100m² of living area).