Data Center Cooling Systems: A Guide to Efficient and Sustainable Solutions Posted on October 5, 2026 As artificial intelligence and cloud computing continue to expand, there has been a construction boom in data centers. But behind every server rack, storage array, and GPU cluster lies one of the biggest challenges for data centers: heat. While we at Total Home Supply know very little about AI and data centers, we do know a thing or two about cooling. As debate grows about the energy impact of data centers, especially when it comes to cooling, we’ve applied our expertise to analyze how data center cooling can become more efficient and sustainable. Why Data Center Cooling Matters More Than Ever Modern AI servers use highly power-dense processors and GPUs that generate substantially more heat than traditional computing equipment. In fact, thermal management is the second biggest energy consumption of data centers, second only to the servers themselves. According to the International Energy Agency (IEA), cooling systems account for more than 30% of the energy used in enterprise-level data center facilities. This growing energy consumption has led to several controversies that hound data centers. Power Grid Impact The IEA estimates that data centers consumed approximately 415 TWh of electricity globally in 2024, or roughly 1.5% of worldwide electricity consumption. Data center electricity demand has been growing approximately four times faster than overall electricity demand, with AI-focused facilities consuming as much electricity as large industrial plants. This has raised concerns about electricity prices, as data centers can push up utility rates higher for surrounding communities due to demand, as well as its impact on grid reliability during peak demand seasons. Water Consumption Cooling systems are also drawing attention because of their water requirements. Large cloud facilities can consume billions of gallons of water annually to support cooling operations. Amazon’s AWS alone used up 2.5 billion gallons of water last year, and it claims that figure is actually more efficient than the industry average in terms of water per KwH. This has led to public scrutiny in areas facing water stress, intensifying public scrutiny, including concerns over residents competing with data centers for water resources, and what could happen during drought conditions. Community Pushback Across America, opposition to new data center projects has increased due to concerns over: Power demand Water consumption Land use Noise Limited permanent job creation Numerous projects have faced intense opposition from local governments and residents. Key Metrics for Data Center Cooling Efficiency With cooling being one of the top resource consumers of data centers, energy-efficient solutions can significantly reduce electricity consumption, water usage, and carbon emissions. A more sustainable data center with efficient cooling systems is not only less costly to operate, it mitigates the environmental and social impact to local communities. Here’s how cooling efficiency can be measured for data centers: 1. PUE (Power Usage Effectiveness) PUE is the total facility energy, divided by IT equipment energy. A lower PUE indicates greater efficiency. Typical Ranges Legacy facilities: 2.0+ Modern enterprise facilities: 1.4-1.8 Efficient hyperscale facilities: 1.1-1.3 2. Cooling System COP Coefficient of Performance (COP) measures the efficiency of the cooling equipment itself. A higher COP value indicates more efficient operation. 3. WUE (Water Usage Effectiveness) Another measure of efficiency is WUE, which tracks the water consumed per unit of IT energy. As water concerns grow, WUE is also becoming increasingly important as a metric of efficiency. With the metrics out of the way, we can now discuss the different types of cooling methods currently used by data center facilities. Major Types of Data Center Cooling 1. Air Cooling Air cooling is the most common system employed by data centers worldwide. Chilled air is delivered to server racks, while the hot air is captured and vented outside the facility. It uses systems like: Computer Room Air Conditioners (CRAC) Computer Room Air Handlers (CRAH) Precision air conditioning Chilled water systems Advantages include: Proven technology using air conditioning adapted for data centers Lower initial costs, thanks to manufacturing scale Easier maintenance Broad compatibility with hundreds or thousands of models However, air cooling is less efficient at high densities, and also carries higher fan energy requirements 2. Hot Aisle and Cold Aisle Containment These containment systems improve on traditional air cooling by preventing hot and cold air from mixing. For a more detailed explanation, see our related article on Server Room Air Conditioners. Benefits include: Reduced cooling waste Improved airflow management Lower energy consumption Better temperature consistency This is often the fastest and most affordable efficiency upgrade available. 3. Free Cooling Free cooling uses naturally cold outdoor air or ambient conditions to reduce mechanical refrigeration requirements. Common methods include: Air-side economizers Water-side economizers Indirect evaporative cooling Many operators achieve substantial energy savings by reducing compressor runtime. However, this method is only effective in cold regions. 4. Liquid Cooling Liquid cooling is rapidly becoming the preferred solution for AI and high-performance computing environments. The Department of Energy’s data center efficiency experts note that liquid cooling can substantially reduce cooling energy consumption, because the heat is removed much closer to the source. It also allows for higher supply temperatures, and increased opportunities for free cooling. Common liquid cooling methods include: Direct-to-Chip Cooling: Coolant is circulated directly to CPUs and GPUs. Rear Door Heat Exchangers: Heat is removed at the rack level. Immersion Cooling: Servers are submerged in dielectric fluid. Benefits of this method include: Dramatically improved heat transfer Lower fan energy requirement Reduced cooling loads The industry forecasts that future AI facilities will increasingly rely on liquid cooling technologies, since traditional HVAC approaches struggle with extremely high rack densities. 5. Hybrid Cooling This combines all the cooling methods mentioned above: Air cooling Liquid cooling Free cooling Economization This approach allows for cooling flexibility while maximizing efficiency. Emerging Cooling Trends In addition to the above cooling methods, the AI industry is looking at new technologies to improve energy usage and reduce heat emissions. These include: AI-Driven Thermal Optimization Operators are looking at machine learning and predictive analytics for optimized thermal performance. Research shows intelligent cooling optimization can significantly reduce facility energy consumption while maintaining safe operating temperatures. Waste Heat Recovery Instead of venting the heat generated outdoors, some facilities now use waste heat recovery systems and practices. This transforms waste heat into a valuable resource, allowing it to be used to heat nearby buildings, support district energy systems, and even supply industrial processes. Higher Operating Temperatures Historically, the IT industry believed cooler was always better. However, new research suggests that modern processors can operate most efficiently at temperatures higher than traditional data center settings. This opens new opportunities to reduce cooling energy consumption. Data Center Cooling Solutions For edge facilities, telecom rooms, server closets, network operations centers, and small-to-medium data environments, Total Home Supply offers several cooling solutions that can help improve efficiency and reliability. Friedrich Hazardgard Series The Friedrich Hazardgard line is specifically designed for demanding environments and hazardous applications where reliability is critical. These units are commonly used in: Industrial control rooms Defense applications Laboratories Telecommunications installations Critical infrastructure Featured Friedrich Hazardgard unit: Friedrich HCM24A30A 24,000 BTU Class Hazardgard Series Air Conditioner This 60Hz unit uses 230/208 volts and has a cooling capacity of 24,000 BTU/Hr. It is the only Hazardgard unit that has Electrofin 5-stage, Immersion Ecoat on ALL of its metallic surfaces of the outdoor coil. This provides outstanding corrosion resistance in coastal or other corrosive environments. It boasts less than 1% thermal degradation while providing outstanding adhesion and chemical resistance for years of protection. Price: $5,149.00 Friedrich HCM24A30A 24,000 BTU Class Hazardgard Series Air Conditioner - R32 Refrigerant - 208/230V Specifically designed for use in areas where flammable liquids or gasses, or other toxic chemicals or other flammable materials are being used or stored. The Fr... View Product You can learn more about the Hazardgard series here. Mini Split Systems Ductless mini splits are increasingly popular for: Server rooms Network closets Telecom facilities Edge data centers These boast high SEER ratings and zoned cooling, while offering improved energy savings and reducing heat losses from ducted units. Please provide commercial-grade mini split if any: Daikin FTXM24WVJU9 / RXM24WVJU9 24000 BTU Class 22.0 SEER2 Wall Mounted Atmosphera Series Single Zone Mini Split System This highly efficient single-zone system provides 21,600 BTUs of cooling and 24,000 BTUs of heating. It boasts 12.0 EER2, 22.0 SEER2, and 10.0 HSPF2 ratings, thanks to the use of R32 refrigerant and variable speed compressor technology. It provides 100% heating capacity at 5°F and cooling capacity up to 115°F. Optional accessories like a drain pan heater enable heating as low as -13°F. Cooling capabilities can be extended to -4°F with a wind baffle and dipswitch adjustments. Price: $5,093.00 Daikin FTXM24WVJU9 / RXM24WVJU9 24000 BTU Class 22.0 SEER2 Wall Mounted Atmosphera Series Single Zone Mini Split System - R32 Refrigerant Daikin introduces the first R32 refrigerant mini split system in the US. R32 is more efficient than R410A, resulting in a lower Global Warming Potential (GWP)... View Product Through-the-Wall Cooling Systems Through-the-wall units allow for simple installation and reliable operation. They are ideal for: Small server rooms Telecommunications spaces Equipment rooms Applicable through-the-wall AC: GE AJCQ12DXXWA 12000 BTU Class Through-the-Wall Variable Speed (6100-12400 BTUs) Room Air Conditioner Thiscooling only through-the-wall unit provides up to 12,000 BTUs of cooling capacity and operates on 208/230-volt power. With a cooling capacity range of 6,100 to 12,400 BTUs, it can efficiently serve a variety of server room sizes. It offers a true built in look with only a minimal 5″ extension into the room with front, while competitor units require a 7.5 minimum extension into the server room with front. It is equipped with inverter technology and built-in WiFi for wireless control. Price: $739.00 GE AJCQ12DXXWA 12000 BTU Class Through-the-Wall Variable Speed (6100-12400 BTUs) Room Air Conditioner - 208/230V - Built-In WiFi - R32 The 26" GE AJCQ Series built-in air conditioners combine modern styling, variable-speed inverter technology, and built-in WiFi for enhance... View Product Ventilation and Air Movement Solutions Proper airflow management remains one of the most cost-effective ways to improve cooling performance. Total Home Supply offers: Commercial exhaust fans Inline ventilation systems Industrial air movement products S&P ventilation equipment These can greatly improve airflow efficiency and reduce hot spots. Best Practices for Efficient Data Center Cooling We might not be IT experts, but we do have years of experience when it comes to optimizing cooling systems across different industries. Consider these tips for efficient thermal performance: ✔ Optimize Airflow Seal cable openings Install blanking panels Use containment systems Eliminate bypass airflow ✔ Raise Temperature Setpoints Within ASHRAE guidelines, higher temperatures can reduce cooling energy. ✔ Use Variable-Speed Equipment Variable-speed technologies in fans, pumps, and compressors allow the system to match demand in real time, greatly reducing electrical consumption and wasted energy. See our guide to inverter technology for more information. ✔ Deploy Environmental Monitoring Continuous monitoring helps identify: Hot spots Airflow problems Energy waste Data center cooling is no longer just an operational requirement… it’s a strategic business and sustainability necessity. As AI drives unprecedented growth in computing demand, cooling systems need to be efficient and eco-friendly. For facility managers and operators seeking dependable cooling solutions for server rooms, telecom facilities, edge computing environments, and mission-critical spaces, We offer a broad selection of mini splits, commercial cooling equipment, ventilation systems, and specialized HVAC products designed to improve efficiency and reliability. Mickey Luongo Mickey is the resident heating and air conditioning expert with over 15 years of experience in the industry.
