A data center power system, comprising: a plurality of server racks aligned within a row in a human-occupiable workspace of a data center, the server racks supporting a plurality of heat-generating computing devices; an air containment structure positioned adjacent the server racks opposite the human-occupiable workspace and; a plurality of fan coil units, wherein the plurality of fan coil units are configured to circulate a cooling airflow from the human-occupiable workspace through the server racks into the air containment structure and into the plurality of fan coil units via hot air ducts; wherein the plurality of fan coil units are configured to cool the airflow and exhaust back the airflow into the human-occupiable workspace via cold air ducts (114 each of the plurality of fan coil units comprising:at least one fan a main power bus electrically coupled to the at least one fan and to a main power source to receive alternating current, AC, power; and a transformer electrically coupled with the main power bus; a control power bus electrically coupled to each of the transformers of the plurality of fan coil units to receive direct current, DC, power transformed from the AC power, wherein the DC power received from each of the transformers of the plurality of fan coil units is recombined along the control power bus with a diode network; a controller electrically powered by the control power bus and communicably coupled to each of the plurality of fan coil units to control the plurality of fans in the plurality of fan coil units to operate at a specified fan speed, wherein at least one sensor associated with a first fan coil unit is electrically coupled to the control power bus to receive DC power from a transformer, through the control power bus, associated with a second fan coil unit. a plurality of server racks aligned within a row in a human-occupiable workspace of a data center, the server racks supporting a plurality of heat-generating computing devices; an air containment structure positioned adjacent the server racks opposite the human-occupiable workspace and; a plurality of fan coil units, wherein the plurality of fan coil units are configured to circulate a cooling airflow from the human-occupiable workspace through the server racks into the air containment structure and into the plurality of fan coil units via hot air ducts; wherein the plurality of fan coil units are configured to cool the airflow and exhaust back the airflow into the human-occupiable workspace via cold air ducts (114 each of the plurality of fan coil units comprising:at least one fan a main power bus electrically coupled to the at least one fan and to a main power source to receive alternating current, AC, power; and a transformer electrically coupled with the main power bus; a control power bus electrically coupled to each of the transformers of the plurality of fan coil units to receive direct current, DC, power transformed from the AC power, wherein the DC power received from each of the transformers of the plurality of fan coil units is recombined along the control power bus with a diode network; wherein the plurality of fan coil units are configured to circulate a cooling airflow from the human-occupiable workspace through the server racks into the air containment structure and into the plurality of fan coil units via hot air ducts; wherein the plurality of fan coil units are configured to cool the airflow and exhaust back the airflow into the human-occupiable workspace via cold air ducts (114 each of the plurality of fan coil units comprising:at least one fan a main power bus electrically coupled to the at least one fan and to a main power source to receive alternating current, AC, power; and a transformer electrically coupled with the main power bus; a control power bus electrically coupled to each of the transformers of the plurality of fan coil units to receive direct current, DC, power transformed from the AC power, wherein the DC power received from each of the transformers of the plurality of fan coil units is recombined along the control power bus with a diode network; a controller electrically powered by the control power bus and communicably coupled to each of the plurality of fan coil units to control the plurality of fans in the plurality of fan coil units to operate at a specified fan speed, wherein at least one sensor associated with a first fan coil unit is electrically coupled to the control power bus to receive DC power from a transformer, through the control power bus, associated with a second fan coil unit.