A heat exchanger assembly (20) includes an inlet manifold (22) that is configured to receive a working fluid (28), a plurality of microtube assemblies (32) that define corresponding plurality passages (34) for the working fluid (28) and an outlet manifold (24) that is configured to exhaust the working fluid (28). The plurality of microtube assemblies (32) include a one-piece unitary structure that has a web portion (46) that extends between at least a first microtube portion (36) and a second microtube portion (38).