In one example, a heat pipe is configured to absorb and transfer heat away from ambient air of a data center to cool the ambient air circulating in the data center to cool devices of the data center, and a fluid interface is thermally coupled to the heat pipe and configured to cool the heat pipe via a coolant fluid circulating in the data center. In another example, a heat pipe configured to release transferred heat to air, and a fluid interface is thermally coupled to the heat pipe and configured to exchange heat to the heat pipe to cool a coolant fluid circulating in a data center to cool devices of the data center.