The HVAC system of a large office building (completed in 1987) integrates ice storage, heat recovery, andc old air distribution. By taking advantage of the unique characteristics of ice, these technologies were added with a minimal increase in the HVAC budget, yet they will have a significant impact on reducing operating costs.This paper explains how the HVAC system was designed to incorporate these technologies and provides ideas and information that may help the designer develop cost-effective ice storage systems. This paper includes:( 1) documentation of the incremental construction costs and projected savings for these technologies and (2) details of the HVAC system design and operation.