Carlson U-Value Windows Ratings
The window industry measures the energy efficiency of their products in terms of thermal transmission, or U-value. The U-value of windows measures the rate of heat transfer through a product. The lower the U-value of a window, the lower the amount of heat loss, and the better a product is at insulating a building.
Carlson specialises in energy efficient eco windows and doors that have u-values as low as 0.61W/m2K as shown below.
Product Type | Std. Windows U-value Double Glazed | Std. Windows U-value Triple Glazed | Glass Energy Rating Double Glazed | Glass Energy Rating Triple Glazed |
Timber | 1.35W/m2K | N/A | uG 1.1 | N/A |
Alu Clad | 1.35W/m2K | 0.99W/m2K | uG 1.1 | uG 0.6 |
Alu Wood Classic | 1.35W/m2K | N/A | uG 1.0 | N/A |
Alu Wood Classic + | N/A | 0.66W/m2K | N/A | uG 0.4 |
GRP Wood | 0.99W/m2K | 0.61W/m2K | uG 0.7 | uG 0.4 |
- The U-values of windows detailed above are for the whole window, including glazing, frame and spacer bars.
- Centre-of-glass u-value (uG) describes the performance of the glazing alone without the effects of the frame.
- For most energy efficient windows, the whole window U-value is higher than the centre-of-glass U-value (uG).