MI Windows and Doors is now offering the 4300 single-hung with Guardian’s 8070 Low-E glass option. This new glass package is titled “Northern ENERGY STAR® because it allows the 4300 to meet ENERGY STAR® requirements for the Northern climate zone when using the ENERGY STAR® equivalent energy performance criteria. This criteria means the Solar Heat Gain Coefficient (SHGC) is high enough to create an energy-efficient balance of the U-Value. Refer to the ENERGY STAR® criteria chart below.
With 8070 Low-E glass, the 4300 now achieves a U-value of 0.30 and a SHGC of 0.53. A 4300 with grids is also ENERGY STAR® -qualified for the northern climate zone, as its SHGC is 0.47.