The building facade can be entirely glass {curtain wall}which is consisting of plates that are metal framed

Since regular glass causes heat accumulation inside the building that definitely leads to A.C. defficiency. In this case, it is necessary to use insulating glass.

In this case the curtain wall faces the building staircase, and the skylight is not air-conditioned. The architecture gave priority to safety element than heat insulation and accordingly, glass is laminated (the exterior layer is made out of blue reflective glass, the interior is plain Clear glass and in between lies the PVB.