Since the curtain wall uses high strength glass and a thicker lamination layer to meet the blast criteria, the design team worked with the curtain wall contractor to optimize the glazing configuration, maximizing light transmittance and minimizing heat gain. With eight inches of insulation (R-17) at the spandrels, a very low infiltration rate (0.02 CFM/Sq Ft) in combination with the integrated shading, EGWW’s high performance envelope and shading system allowed the radiant panel ceiling system to be utilized, resulting in more than a $2M reduction in lifecycle costs compared to the GSA’s traditional Variable Air Volume system. We are projecting an energy savings of $300,000 to $400,000 annually compared to the existing building.