The HVAC (Heating, Ventilation and Air-Conditioning) system at St. Philip’s was designed for a Silver LEED certified building. It is an extremely energy efficient design which uses TROX low air flow units in all of the classrooms. When you put your hand on the bottom of the units where the air comes out, you can barely feel the air flow. But it is flowing at a constant rate and uses induction to ventilate the rooms. The system is controlled by a sophisticated BMS (building management system) that allows us to control the times when it is operating and the temperatures throughout the building. It also controls the lighting in the building. So, for example, we can program it to shut down HVAC and lighting on holidays and only operate during limited hours on weekends. The system is also designed to take into account the effects of the sun as it moves around the building during the day. The temperature of the cooling or heating water that flows through the TROX units has four zones corresponding to the four sides of the building. The interior spaces are controlled by variable speed units with reheat coils. They can sense whether a room is occupied or not and adjust air flow accordingly.