eere.energy.gov6 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012 Glazing Assembly U-factorSHG Single glass10.87 Standard insulated glass 0.500.75 Low-e, high SHGC insulated glass 0.300.74 Low-e, low SHGC insulated glass 0.300.41 Comparison of SHGC and U-Factor WINDOWS & DOORS Photo courtesy of US Department of Energy