Ashrae 90.4 Pdf [updated] Jun 2026

Purchase the official ASHRAE 90.4-2022 PDF from the ASHRAE website today. Then, use the compliance workflow outlined above to benchmark your design or existing facility. In the high-stakes world of data center operations, efficiency equals reliability—and ASHRAE 90.4 is the key to unlocking both.

Data centers that comply with ASHRAE 90.4 can benefit from: ashrae 90.4 pdf

Here is a guide to the contents of ASHRAE 90.4: Purchase the official ASHRAE 90

This path allows for trade-offs between the mechanical (MLC) and electrical (ELC) systems. If a designer creates an incredibly efficient cooling system, the electrical system is allowed a slightly higher loss profile, provided the meets the standard's targets. This path fosters innovation in liquid cooling, economizer deployment, and advanced power topologies. ASHRAE 90.4 vs. ASHRAE 90.1: How They Interact Data centers that comply with ASHRAE 90

Power Usage Effectiveness (PUE) is the most famous metric in the data center industry, calculated as Total Facility Energy divided by IT Equipment Energy.

Many jurisdictions (including parts of the US and international regions) have adopted ASHRAE 90.4 by reference. If you are a code official, your jurisdiction may provide access. Check with:

It covers new data centers, additions to existing facilities, and major alterations that require new mechanical or electrical systems.