Window assembly

A window assembly, comprising:

• a first pane of glass, the first pane of glass being chemically strengthened and exhibiting a surface compressive stress of 400 MPa or more and a Vickers hardness of 550 kgf/mm2 or more;
• a second pane of glass having a first major surface and a second major surface, wherein the second major surface of the second pane of glass and a first major surface of the first pane of glass face each other, the second pane of glass comprising 68-74 weight % SiO2, 2-6 weight % MgO, 1-10 weight % CaO, 12-16 weight % Na2O, 0-1 weight % K2O, 0.8-2.0 weight % Fe2O3 (total iron) wherein 20-30% of the total iron is ferrous iron calculated as Fe2O3, 0-1.25 weight % TiO2, and 0-1.25 weight % CeO2;
• and
• a polymeric interlayer provided between the first pane of glass and the second pane of glass,
• wherein the window assembly exhibits a direct solar transmittance, integrated over the wavelength range 300 to 2500 nm according to the relative solar spectral distribution for air mass 1.5, of 55% or less and a total solar transmittance, integrated over the wavelength range 300 to 2500 nm according to the relative solar spectral distribution for air mass 1.5, of 65% or less.