North Suburban Medical Center, in the effort to upgrade the capacity and efficiency of their heating and cooling systems, undertook an expansion of their central plant including a 1400 square foot penthouse with a screened cooling tower platform above. The design of the penthouse, platform, and mechanical systems accommodate for future expansion of the central heating and cooling systems. The scope included replacing the two existing chillers, two existing boilers, existing cooling tower, and all of the existing circulation pumps.