As colocation data centers evolve toward more “intelligent”, high-density infrastructure, cabinet design is becoming an increasingly important part of managing power, cooling, and hardware capacity.
According to the Uptime Institute’s 2024 Global Data Center Survey, about 43% of colocation providers reported rapidly increasing power demand. This puts cooling infrastructure at the forefront of concerns for most data center facilities, especially if this trend continues to rise.
As power demands increase, effective cooling becomes essential to maintaining reliable data center operations. Colocation facilities rely on cooling systems, strong airflow, and temperature monitoring to remove the excess heat and protect customer equipment.
This guide walks you through the inside of a colocation data center, revealing how cooling keeps up with the increasing power demand, helping you plan colocation racks efficiently.
Why Does More Power Mean More Heat?
Every server component that consumes electricity generates heat as a byproduct. CPUs, GPUs, memory, and storage devices all contribute to the total heat output of a rack. As data centers install more powerful hardware and increase rack power density, they generate more heat in the same amount of space. So, all cooling systems must remove this heat to keep the servers within their recommended temperature range.
Note: High-density computing can push thermal loads to 40 kW or more.
How Does Data Center Air Cooling Work?
A data center cooling system does more than lower the room temperature. It manages airflow, removes heat generated by servers, and monitors environmental conditions across the facility. The cooling units supply conditioned air to server racks, while hot aisle and cold aisle layouts help control how air moves.
- CRAC / CRAH Units: Supply conditioned air to the data center. CRAC units use refrigeration, while CRAH units use chilled water.
- Cold Aisle: Delivers cool air to the front of server cabinets, where intake fans draw it in.
- Hot Aisle: Collects heated air released from the rear of server cabinets and directs it toward the cooling system.
- Raised Floor: Creates space beneath the data center floor for air distribution and cable routing.
- Underfloor Supply Air: Carries conditioned air beneath the raised floor and delivers it through perforated floor tiles.
- Temperature Sensors: Monitor environmental conditions and help operators adjust cooling.
- Fire Suppression System: Detects and suppresses fires to protect equipment and facility infrastructure.
- Power Distribution: PDUs and power cables distribute electricity to equipment inside server racks.
The cooling setup shown above represents a traditional air-cooling system. It uses CRAC or CRAH units, cold and hot aisles, and controlled airflow to remove heat from server racks. A lower Power Usage Effectiveness indicates better energy efficiency in data centers.
This approach remains widely used across data centers, but rising rack power densities are putting greater pressure on conventional cooling infrastructure.
Note: Traditional data centers manage thermal loads of 2 to 5 kW per rack, and air cooling is typically used for less than 20 kW per rack.
Note: Efficient load balancing prevents overheating and system failures.
How Data Centers Keep Up with Rising Power Demand
To support more demanding workloads, some data centers are adding liquid cooling to their infrastructure. Liquid cooling is often introduced alongside existing air-cooling systems, particularly for high-density deployments.
This shift is already happening, although liquid cooling has not replaced traditional air cooling. According to Uptime Institute’s 2025 Cooling Systems Survey, 22% of respondents reported using direct liquid cooling in their data centers, while 75% still used perimeter air cooling.
S&P Global’s 2025 survey found that 21% of organizations relying on air cooling planned to introduce liquid cooling within 12 months. Another 25% planned to do so within 2 to 4 years.
Note: Power Density measures a facility’s ability to support high-density compute workloads.
How Direct Liquid Cooling (DLC) Works
Direct liquid cooling removes heat directly from high-temperature components, such as CPUs and GPUs, using liquid coolant instead of relying entirely on airflow. The infographic shows the main components involved in this process:
- Cooling Tower / Chiller: Removes heat from the coolant and releases it outside the facility.
- Coolant Distribution Unit (CDU): Circulates coolant and regulates its temperature throughout the system.
- Liquid-Cooled Server Racks: House servers connected to the liquid cooling loop through dedicated piping.
- Cold Plates: Attach directly to CPUs and GPUs, transferring heat from these components to the circulating coolant.
As the coolant absorbs heat from the server components, it carries that heat away to the cooling system, where it is removed before the coolant returns to the servers. This process supports high-density deployments with greater cooling demands.
See Also: Top 8 Colocation Providers
Is Liquid Cooling Becoming More Common
The shift toward liquid cooling is gaining momentum as data centers accommodate more powerful servers and higher rack densities.
Numbers show that 22% of respondents to the survey used direct liquid cooling, while 69% identified higher rack densities as one of their main adoption drivers.
AI workloads are adding to this demand. Uptime Institute’s 2025 AI Infrastructure Survey found that 51% of operators hosting AI applications were upgrading their cooling systems to support these workloads. Colocation facilities accounted for 34% of the primary hosting locations reported by organizations running AI inference.
Rack Planning for High-Density Deployments
A cabinet is no longer just a place to install servers. Its configuration directly affects how businesses plan power, cooling, equipment capacity, and future expansion.
That’s why rack infrastructure must keep pace with growing performance demands, higher power densities, and increasingly complex cooling requirements.
💡 2026 Industry Snapshot
According to Uptime Institute’s 2026 Global Data Center Survey, the most commonly reported rack power density rose to 11 kW in 2026, up from 9 kW in 2025.
That shift reflects growing demands on data center power and cooling infrastructure. As deployments evolve, rack planning must account for more than physical dimensions alone.
Here’s what the latest 2026 data says:
- The rise of AI workloads could account for nearly half of all data center demand by 2030, compared with approximately one-quarter in 2025.
- 62 GW of additional leased capacity is expected to be added globally between 2026 and 2030, including colocation and build-to-suit facilities.
- 46% of enterprise data center decision-makers surveyed said they plan to adopt liquid cooling within the next four years.
Together, these trends point to a clear shift that data center infrastructure must supply by adopting core technologies. Businesses no longer plan physical space alone. It’s about ensuring cabinets can support the power, cooling, connectivity, and hardware of today’s deployments.
What Makes Up a Modern Data Center Rack?
A modern data center rack houses the hardware and supporting components needed to run applications, store data, and maintain network connectivity.
Most racks combine several core components:
| Rack Component: | Primary Function: |
| Physical Servers | Run applications, databases, and AI workloads. |
| Network Switches | Connect servers to networks and other devices. |
| Patch Panels | Organize network connections and cable routing. |
| NAS Storage | Store shared files, backups, and business data. |
| Firewalls | Filter traffic and help prevent unauthorized access. |
| Cable Management | Organize cables for easier maintenance and airflow. |
| PDU (Power Distribution Unit) | Distribute electricity to rack-mounted equipment. |
| UPS Backup | Provide temporary backup power during outages. |
| Cooling and Airflow | Remove heat and maintain suitable temperatures. |
Note: Service Level Agreements should guarantee uptime of 99.999% or better. Also, physical security measures should include biometric access controls and CCTV surveillance.
These components must work together as a single system. So space alone is not enough to determine whether a rack is suitable for a certain project.
The equipment placement also affects cable routing, maintenance access, airflow, and the ability to accommodate future infrastructure needs.
Note: Standard IT racks are typically 42U in height.
How Are Modern Workloads Changing Rack Design?
Modern workloads are changing how data center racks are configured, from AI accelerators and high-performance storage to faster networking and distributed computing. These technologies introduce different requirements for hardware setup, connectivity, cooling, and maintenance.
Here are some of the key industry trends and market patterns:
- AI & GPU Computing: GPU servers can require more space, power, and specialized cooling than conventional server configurations.
- High-Speed Storage: NVMe storage arrays and growing datasets increase demands on drive capacity, connectivity, and data throughput.
- Faster Networking: High-speed switches and additional cabling make network layout and cable management increasingly important.
- Scalability Options: Modular configurations and sufficient room for additional equipment help businesses accommodate changing workloads.
As these requirements evolve, rack design must account for how equipment works together, not just how much hardware fits inside the cabinet. This is important in Colocation, where physical space, AC allocation, cooling, and connectivity must align with the facility’s capabilities.
Tip: Small businesses benefit from per-U or fractional cabinet rentals for cost savings.
How Does Rack Configuration Affect Colocation Planning?
Rack configuration affects how efficiently businesses use their colocation space and how easily their infrastructure can be installed, maintained, and expanded.
Before deploying equipment, consider these key factors:
- Rack Dimensions: Verify servers, switches, and storage equipment fit correctly.
- Power Allocation: Confirm the facility can support your electrical requirements.
- Cooling & Airflow: Account for heat output and the cooling capabilities available.
- Rack Connectivity: Plan the network ports, cross-connects, and cable routing.
- Future Expansion: Consider additional hardware and future changing workload.
Keep in mind that the total cost of ownership involves reviewing rack rental pricing and associated fees. Also, Carrier-neutral facilities allow multiple telecommunications providers to operate. In addition, the reliable colocation facilities should adhere to Uptime Institute Tier standards. For instance, Tier III or Tier IV ratings indicate enterprise reliability with fault tolerance.
See Also: Top Data Center Compliance Standards for Colocation
Need Help with Colocation Deployment?
ServerMania offers Full Cabinet and Customized Cabinet Colocation Solutions for businesses looking to deploy and manage their own server infrastructure.
Our colocation facilities span across Canada, North America, and Europe. Location matters because geographical risk assessment is crucial for data center site selection. Our remote Hands services provide physical support for server management when needed, and independent certifications like ISO 27001 & SOC 2 Type II verify security practices. On top of all that, our Colocation offers better connectivity through multiple ISPs, with locations such as Amsterdam and New York close to the major exchanges.
With a wide range of supported workloads, our power distribution and cooling system is designed to accommodate the latest and most advanced AI workloads.
💬Explore our managed colocation servers to find the right infrastructure for your business. If you have questions, get in touch with our 24/7 customer support or book a free consultation.
Frequently Asked Questions:
How Does Rack Layout Planning Affect Data Center Cooling Efficiency?
Effective rack layout planning improves airflow management by separating hot and cold air through a cold aisle configuration and cold aisle containment. This approach directs cold air toward IT equipment while preventing hot air from recirculating, improving cooling efficiency and reducing cooling costs.
What Are the Different Cooling Methods Used in High-Density Data Centers?
Modern cooling technologies include traditional air cooling, liquid cooling systems, rear door heat exchangers, and immersion cooling for high-density racks. Choosing the right cooling method depends on energy consumption, equipment heat output, and thermal management requirements.
How Do Rack Dimensions Affect Colocation Planning?
Rack height, rack width, and available rack units determine how much computing equipment fits within the same footprint. Both open frame racks and closed frame racks require appropriate hardware, including cage nuts and cable management hardware, to support secure equipment installation.
Why Is Cable Management Important in a Data Center Rack?
Organizing power and data cables separately helps data center professionals maintain accessibility, reduce airflow obstructions, and protect network equipment. Proper routing of network cables also supports efficient maintenance of networking devices and other critical components.
How Do Data Centers Maintain Continuous Operation During Power Failures?
Reliable data center infrastructure management includes redundant power supply configurations, battery backup systems, and two independent distribution paths to support continuous operation. These independent distribution paths reduce the risk of equipment failures caused by a single power distribution fault.
How Are AI Workloads Changing Data Center Infrastructure Requirements?
Artificial intelligence and demanding computer systems increase power density, placing greater pressure on cooling components and overall data center performance. Modern data center management must account for these changing data center requirements while minimizing the environmental impact of growing infrastructure.
What Is the Difference Between Retail and Wholesale Colocation?
Retail colocation typically provides smaller deployments with individual cabinets or partial rack space, while wholesale colocation supports larger deployments requiring substantial power and dedicated space. Both models provide infrastructure for IT equipment, with physical security and facility services supporting businesses that operate their own hardware.
How Does Cooling Infrastructure Support Cloud Services and AI Applications?
Large data centers supporting cloud services and AI applications rely on cooling infrastructure to remove heat generated by high-performance servers. Effective rack layout, controlled ambient air conditions, and suitable cooling infrastructure help maintain reliable operating temperatures across demanding deployments.
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