Glass replacement for a piece of insulating window glass gets expensive ... lean the frame against a wall and have a helper steady the frame while you set the bottom edge in place, then tip ...

Increasing the thermal performance of a window or complete curtain wall system, insulated glass units (IGUs) reduce heat gain in warmer seasons while retaining more during colder periods.

The architectural team from Bergmeyer Associates, based in Boston, used smooth insulated metal panels (IMPs) with metallic coatings and a glass curtain wall to further the contemporary design choices.