Minimum Energy Performance Requirements for Window Replacement in the 28 EU Member States
In 27 EU Member States (out of 28) minimum requirements for windows have been introduced. These requirements can be regrouped in three categories: minimum requirements based on the U-value (being Uwvalue or Ug-value), on the Uw-value and g-value separately or on the energy balance combining both the Uw-value and g-value.