Global data center cooling strategies are at a turning point. As AI era workloads drive unprecedented heat densities and ASHRAE guidelines push operators toward higher water supply temperatures traditional room level cooling is no longer enough to keep pace.

Rear Door Heat Exchanger (RDHx) systems are quickly emerging as a critical bridge technology enabling efficient rack level cooling that supports hybrid architectures and direct to chip deployments without overhauling the entire facility.

In this whitepaper we explore:

• How ASHRAE W and S Class guidelines are reshaping water temperature strategy
• The role of condensate and dew point management in safe scalable deployment
• The growing importance of sensing redundancy and remote monitoring for reliability