A cooling system configured to remove heat from a chimney of a server cabinet. The cooling system including a first chimney portion adjacent to the server cabinet, a second chimney portion extending from a top of the first chimney portion, wherein the second chimney portion is disposed above the server cabinet, a chimney heat exchanger disposed in the second chimney portion and above the server cabinet, a fluid inlet for providing a working fluid to the chimney heat exchanger, a fluid outlet for discharging the working fluid from the chimney heat exchanger, and an air handler heat exchanger connected to the chimney heat exchanger by a return air plenum, wherein the chimney heat exchanger has an upstream surface that receives waste heat generated by a server disposed in the server cabinet and a downstream surface that discharges air to the return air plenum.