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.

See our energy chart below for Bruckner windows.

Glazing Options and Technical Data

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