You can read more about EU energy efficiency requirements here: https://ec.europa.eu/energy/en/topics/energy-efficiency/buildings https://ec.europa.eu/energy/e

You can read more about EU energy efficiency requirements here: https://ec.europa.eu/energy/en/topics/energy-efficiency/buildings https://ec.europa.eu/energy/en/topics/energy-efficiency/buil... You can be sure Germany had a primary role in establishing these standards.