Specifications include, but are not limited to: Heating Both buildings are heated using steam from the Virginia Commonwealth University (VCU) steam plant. The steam is provided to these building by means of a piping system in the underground utility tunnels. Each building has a separate steam meter for measuring the amounts of steam used. Steam supply for the Annex building is provided through the tunnel system from the Highway building. Cooling Both buildings are cooled using chilled water. There are two (2) chillers located in the Annex’s basement mechanical room that provide cooling to both the Annex and Highway Buildings. The chilled water is provided to the Highway Building through piping in the underground utility tunnel from the Annex building. There are three (3) Baltimore Aircoil Company, Inc. (BAC) cooling towers on the Annex Building roof which are for the chillers supplying cooled water to the Annex and Highway Building. The Highway Building basement computer rooms are currently served by eight (8) Computer Room Air Conditioner (CRAC) units. There are supplemental HVAC systems in use for some of the data and telephone equipment rooms, and throughout the buildings as needed. Air Distribution Air distribution in the Annex Building is provided by five (5) large air handlers, three (3) in the penthouse mechanical room and two (2) in the basement mechanical room. The Annex also perimeter induction units at all floors. Air distribution in the Highway Building is provided by seven (7) air handlers, three (3) large units in the penthouse mechanical room and four (4) smaller units in the basement mechanical room. Building Controls The HVAC controls for all buildings are a combination of pneumatic controls and Direct Digital Control (DDC), and are part of a Staefa Control System (also known as Landis Staefa).