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An essential for professionals in data center design and operations. Keep up to date with the latest in standards and guidance on cooling, energy, humidity, and smart grid solutions.

TC 9.9 was formed to address concerns of TC 9.9 Mission Critical Facilities, technology spaces and electronic equipment, designs, operations, maintenance, and efficient energy usage of modern data centers and technology spaces.

TC9.9’s Mission Statement: To be recognized by ALL areas of the datacom industry as the unbiased engineering leader in HVAC and an effective provider of technical information for the datacom industry.


ASHRAE TC 9.9 Datacom Encyclopedia

The ASHRAE TC 9.9 Datacom Encyclopedia evolved in 2024 from the longstanding ASHRAE Datacom Series, a series of print books that provides information on data center related subjects. Over time, the pertinent information from all the books in this series will transition to be housed in this online encyclopedia, which will replace the book series completely. This comprehensive online encyclopedia collects essential knowledge about important datacom topics such as facility design considerations, ITE design considerations, environmental guidelines, cooling technologies, and energy efficiency in a central hub, providing on-demand access to frequently updated datacom-related content anytime, on any device, anywhere. Access to the encyclopedia is granted via payment of an annual subscription fee.

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Data Center Standards and Guidance from ASHRAE

ANSI/ASHRAE Standard 90.4-2022, Energy Standard for Data Centers

Standard 127-2020, Method of Testing for Rating Air-Conditioning Units Serving Data Center (DC) and Other Information Technology Equipment (ITE)

ASHRAE Handbook—HVAC Applications, Chapter 20, Data Centers and Telecommunication Facilities (I-P)

ASHRAE Handbook—HVAC Applications, Chapter 20, Data Centers and Telecommunication Facilities (SI) 


ASHRAE Datacom Series

The Datacom Series, a staple in the data center industry for nearly two decades, provides comprehensive treatment of data center cooling and related subjects. Over time, the pertinent information from all the books in this series will transition to be housed in the ASHRAE TC 9.9 Datacom Encyclopedia, which will replace this book series completely.

  1. Thermal Guidelines for Data Processing Environments, Fifth Edition, Revised and Expanded
  2. IT Equipment Power Trends, Third Edition
  3. Design Considerations for Datacom Equipment Centers, Second Edition
  4. Liquid Cooling Guidelines for Datacom Equipment Centers, Second Edition
  5. Structural and Vibration Guidelines for Datacom Equipment Centers
  6. Best Practices for Datacom Facility Energy Efficiency, Second Edition
  7. High Density Data Centers - Case Studies and Best Practices
  8. Particulate and Gaseous Contamination in Datacom Environments, Second Edition
  9. Real-Time Energy Consumption Measurements in Data Centers
  10. Green Tips for Data Centers
  11. PUE™: A Comprehensive Examination of the Metric
  12. Server Efficiency - Metrics for Computer Servers and Storage
  13. IT Equipment Design Impact on Data Center Solutions
  14. Advancing DCIM with IT Equipment Integration

Data Center Courses

ASHRAE eLearning Course Package: Data Center Design | 5.5 PDHs

Designing and Operating Data Centers for the Internet of Everything: Mitigating Risk and Optimizing Performance | 6 Hours

Changing Environments and Loads for Data Centers (High Density, Liquid Cooling, Edge Computing) | 3 Hours


ASHRAE Journal Podcast 

Revolutionizing Data Center Sustainability With AI and Purpose-Built Solutions

Energy Efficiency in Data Centers


ASHRAE Journal Articles 

Achieving Significant Additional Savings: Using a Data Center Upgrades Approach in Already Highly Efficient Buildings

Data Centers Column: Strategies for IECC 2021 Compliance in Hot Climates With Air-Cooled Chillers

Higher-Efficiency Redundancy Strategy for Data Center Cooling

Optimizing the Existing Data Center Environment: Using the X-Factor Reliability Metric

90.4: Energy Standard For Data Centers


Science and Technology for the Built Environment Articles 

Airflow uniformity and energy consumption investigation on data centers enhanced by jet fans

Guidance for data-center CFD (RP-1675)

Model-based data center cooling controls comparative co-design


Government Engagement

Input to European Commission on Eco-design of Servers and Data Storage Products

ASHRAE Letter to GSA re Federal Data Centers

2020 Best Practice Guidelines for the EU Code of Conduct on Data Centre Energy Efficiency


Free Resources: White Papers and Technical Bulletins

Cold Weather Shipping Acclimation and Best Practices

Data Center Power Equipment Thermal Guidelines and Best Practices

Data Center Storage Equipment – Thermal Guidelines, Issues, and Best Practices

Edge Computing: Considerations for Reliable Operation

Emergence and Expansion of Liquid Cooling in Mainstream Data Centers

Hard Disk Drive Performance Degradation Susceptibility to Acoustics 

Water-Cooled Servers Common Designs, Components, and Processes


Related Resources

ASHRAE TC 9.9 Website

CIBSE – Data Centres: An Introduction to Concepts and Design, KS18

90.4 Standard Fact Sheet


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