Window energy rating is a method for assessing the total energy performance of a complete window.
Window energy rating clearly identifies the best performing window as a whole system rather than simply considering the frame or glass.
Correctly designed and installed windows will significantly reduce energy usage, thus drastically reducing fuel bills (up to 30% of the heat lost from a home is lost from the windows).
By reducing the energy use of houses we can achieve a reduction in CO2 emissions. Modern energy efficient windows offer extraordinary thermal performance.
We believe that we can achieve the best U value for windows in Ireland.
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Window Type | Glass Value: 1.1 W/m2K |
Glass Value: 1.0 W/m2K |
Glass Value: 0.9 W/m2K |
Glass Value: 0.7 W/m2K |
Glass Value: 0.6 W/m2K |
Glass Value: 0.5 W/m2K |
Glass Value: 0.4 W/m2K |
Wood Alu-Passive | - | - | - | 0.80 | 0.75 | 0.69 | 0.61 |
Wood-Alu Low Energy | - | - | - | 0.85 | 0.79 | 0.72 | - |
Wood-Alu 78/82 | - | - | - | 0.93 | 0.87 | 0.80 | 0.73 |
Wood-Alu | 1.24 | 1.18 | 1.11 | 0.97 | 0.90 | 0.83 | 0.77 |
Wood | 1.24 | 1.17 | 1.10 | 0.97 | 0.90 | 0.83 | 0.77 |
PVC Ultimo | 1.25 | 1.18 | 1.11 | 0.98 | 0.91 | 0.84 | 0.78 |
PVC Elegance | 1.21 | 1.15 | 1.08 | 0.94 | 0.88 | 0.81 | 0.74 |
PVC Elegance Thermo | 1.18 | 1.11 | 1.05 | 0.91 | 0.84 | 0.78 | 0.71 |
Calculation based on a window size of 1230 X 1480
mm U-value of the glassacc. to DIN EN 673 - "Ug" Energy permeability percentage = g-value acc. to DIN EN 410 Sound proof glass also available. |
Frame Values | |
Window System | U value Frame Construction |
Wood-Alu Passive House Window | Uvalue = 0.76 W/m2K |
Wood-Alu Low Energy Window | Uvalue = 0.89 W/m2K |
Wood-Alu Window 78/82 | Uvalue = 1.18 W/m2K |
Wood-Alu Window | Uvalue = 1.30 W/m2K |
Wood Window | Uvalue = 1.28 W/m2K |
PVC Window Ultimo 9.1 | Uvalue = 1.30 W/m2K |
PVC Window Elegance | Uvalue = 1.20 W/m2K |
PVC Window Elegance Thermosteele | Uvalue = 1.10 W/m2K |
Wood-Alu Composite | Uvalue = 1.24 W/m2K |
PVC Alu Composite | Uvalue = 1.30 W/m2K |