Is an Energy Index an absolute measure of the energy performance of a specific window?
] A: No. The actual energy performance for a specific window will depend on many factors such as the size of the window, the location of the window in the building, the building parameters such as insulation and occupancy, the local climate, the indoor temperature set by the occupants etc. The BFRC rating is designed to allow easy comparison between two or more window products hence simulations are completed in order to compare relative window performance under identical conditions.
