5.2 : Windows




5.2.8 Typical Thermal Performance of Residential Windows, by Type
Solar Heat Gain Visual
U-Factor Coefficient Transmittance
Single-Glazed Clear 0.84-1.16 0.64-0.76 0.65-0.75
Single-Glazed with Bronze Tint 0.84-1.16 0.54-0.65 0.49-0.56
Double-Glazed Clear 0.44-0.76 0.56-0.68 0.59-0.68
Double-Glazed with grey/Bronze Tint 0.44-0.76 0.47-0.56 0.44-0.51
Double-Glazed with High Performance Tint 0.44-0.76 0.39-0.47 0.50-0.57
Double-Glazed with High-Solar Gain Low-e Glass, Argon/Krypton Gas 0.29-0.61 0.53-0.64 0.54-0.62
Double-Glazed with Moderate-Solar Gain Low-e Glass, Argon/Krypton Gas 0.27-0.60 0.44-0.53 0.55-0.65
Double-Glazed with Low-Solar Gain Low-e (1) Glass, Argon/Krypton Gas 0.26-0.59 0.30-0.37 0.51-0.59
Triple-Glazed (2) with High-Solar Gain Low-e Glass, Argon/Krypton Gas (3) 0.15 0.51 0.65
Triple-Glazed (2) with Low-Solar Gain Low-e (1) Glass, Argon/Krypton Gas (3) 0.14 0.33 0.56
Note(s): 1) Spectrally selective. 2) Includes double glazing with suspended film. 3) Center of glass properties, does not include frame or installation properties.









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