The Energy Label evaluates the energy efficiency of a 2-leaf window in winter, based on the calculation of the equivalent Uw value for a reference window (dim 1550x1150). The equivalent Uw value takes into account heat losses and also solar energy gains. The smaller the value, the more efficient the window is; negative values are even possible, in which case the window gains more energy than it loses.
The classification is as follows:
|Class A||Uw,eq||< 0.0||high-performance|
|Class B||Uw,eq||< 0.1||efficient|
|Class C||Uw,eq||< 0.2||good windows|
|Class D||Uw,eq||< 0.3||standard windows|
|Class E||Uw,eq||< 0.4||standard windows|
|Class F||Uw,eq||< 0.8||existing windows|
|Class G||Uw,eq||> 0.8||existing window to be changed|
By choosing elements with energy efficiency A or B, you will make a good investment.
A Swiss certificate is granted for windows made in Switzerland and bears a Swiss cross at the top left. This certificate is controlled by the FFF (Swiss Association of Window and Facade Manufacturers). The energy label is a simple and clear way to identify the right products.