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Thanks for your response I tried to double clear glass (2004) with a frame of aluminum with thermal brake : U-value(glass only)= 0.48 Btu/hft2°F and NRFC U-value=0.57 Btu/hft2°F the problem that I get a window conductance value=1.47 Btu/hft2°F. Even when i change the frame width or conductance nothing change