Energy label
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.