≤46°F (8°C)
Free cooling
At low outdoor temperatures, the system relies primarily on the refrigerant pump to minimize compressor runtime and reduce energy consumption.
Telecom & distributed infrastructure cooling
Keep cooling stable.Use less power.
VENTUS Smart Free Cooling maximizes energy efficiency by minimizing compressor runtime whenever operating conditions allow.
25+years in telecom cooling
9K+units supplied as of May 2026
KT · SKTcertified and deployed
Deployments
Installed across Korea.
Documented VENTUS installations at 143 telecom sites across 16 provinces and metropolitan cities, from Seoul equipment rooms to Jeju base stations.
South Korea
Seoul metro39 sites
×2.4
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- 143
- Documented sites
- 16
- Provinces & metros
- 2020–26
- Recorded period
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See where VENTUS is installed.
Photos, products and installation dates for each site appear here.
Documented sites only. Not a complete delivery list.
Latest installations
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Applications
High-efficiency cooling for sites that never stop.
From base stations and equipment rooms to edge infrastructure and modernization projects, VENTUS supports continuous 24/7 cooling with lower energy demand.
- 01
Telecom shelters
Continuous cooling for base stations and remote telecom rooms.
- 02
Exchanges & equipment rooms
Stable temperatures for thermally sensitive telecom equipment.
- 03
Edge infrastructure
Compact technical spaces with rapidly changing load and ambient conditions.
- 04
Facility modernization
Replacement of aging HVAC systems and reduction of cooling power.
Engineered for each site
Configured around your site.
VENTUS can adapt mounting, airflow, equipment layout, and enclosure interfaces for nonstandard installations, including container mounted applications. Final scope is confirmed through engineering review.
MountingAirflowLayoutInterfaces
Example configuration
Technology
Smart Free CoolingAdaptive control
Smart Free Cooling precisely adjusts operation in real time based on outdoor temperature and cooling load. It is the VENTUS technology that cuts unnecessary compressor runtime and energy use to dramatically reduce annual energy consumption.
Configuration image based on SFC technical drawings.
46–68°F (8–20°C)
Hybrid
The refrigerant pump and compressor work together to reduce unnecessary operation at full output and improve overall system efficiency.
>68°F (20°C)
Compressor
At high outdoor temperatures or under heavy thermal loads, the compressor provides the cooling capacity required to maintain stable cooling performance.
35 registered patents in Korea, the U.S., China and Japan, including the cooling apparatus and its control method.
Performance
VENTUS efficiency, shown in measured results.
Efficiency rises as outdoor temperature falls, reaching 88.6 Btu/Wh at 37.4°F and 50% load.
Converted EER by outdoor temperature
At 100% load, efficiency is 4.5× higher at 37.4°F than at 95°F.
Smart Free Cooling turns the compressor off in free cooling mode and draws power only for the refrigerant pump, so it records an EER that cannot be compared with the ratings of compressor-based systems.
95°F · 100% load
10.9Btu/Wh
111,800 Btu/h cooling
10.296 kW input
Compressor active
37.4°F · 100% load
49.0Btu/Wh
108,200 Btu/h cooling
2.207 kW input
Free cooling
37.4°F · 50% load
88.6Btu/Wh
62,100 Btu/h cooling
0.703 kW input
Free cooling
Independent laboratory evaluation
Tested by a CNAS-accredited (ILAC-MRA) laboratory under KT supervision, report no. 202510-RD-001. Outdoor-unit sound held to 69 dBA or less.
Field-representative installation
Full- and partial-load tests run on a refrigerant piping length that reflects field conditions.
Fully automatic operation
Measured with no manual intervention, reflecting real operating behavior.
Estimated annual energy use, Los Angeles
10RT (35.2 kW) unit at a 70.2% annual average load
Test conditionsIndoor ≈81°F dry bulb · Outdoor 95–37.4°F · 100% / 50% load · 98.4 ft (30 m) piping · Values averaged over 35 minutes after stabilization
Estimated, but not a rough guess: the efficiency gap between the two systems is measured.The starting point is the K-HVAC report (AR-25-281, manual mode), measured at an accredited test laboratory, which compares a conventional inverter-type DX unit and VENTUS Smart Free Cooling at 37°F, 54°F and 95°F outdoor temperature and 100% load. That annual comparison was originally run on Korean weather. We kept the measured efficiency difference at each temperature and changed only the weather, using five years of hourly Los Angeles (LAX) temperatures, 2020–2024 (NOAA / NSRDB), with values between test points interpolated. Only the weather is estimated, which is why we call the result an estimate. Same method: San Jose −54%, New York −51%, Washington, DC −50%. Reference: a conventional inverter-type (variable-speed compressor) 10RT DX air conditioner.
Notes
Unit conversion: 1 kW = 3,412 Btu/h; 1 W/W = 3.412 Btu/Wh. Converted values are provided for unit comparison only and are not AHRI 390 certified ratings. Results apply to the tested sample under the stated conditions.
Company
Proven since 1999.
1999Prototype testing with SKT begins
KT · SKTTwo major telecom operators in South Korea
9,316 UnitsCumulative deliveries as of May 2026
From prototype and base-station field trials with SKT to certification by KT and SKT, nationwide deployment, and the continued advancement of Smart Free Cooling, VENTUS brings decades of proven telecom cooling experience.
A track record built in telecom operations
- 1999–2002
Field Validation
SKT prototype testingThree rounds of base-station field trials2003 certification and pilot deployment
- 2003–2018
Certification & nationwide deployment
2003–2009 · 3,355 units supplied to SKT2011 · KT certification2012–2018 · Expanded supply to both carriers
- 2019–2025
Smart Free Cooling Advancement
2018 · Transition to Smart Free Cooling2019 · SFC 1.0 certified by KTSFC 2.0 · KT in 2024 · SKT in 2025
- 2026 →
Next-Generation Transition
May 2026 · SKT 116 units · KT 66 unitsR-454B applied (2026 target)AI operating platform in active development
Next-generation refrigerant R-454B · Applied (2026 target)
Under the U.S. EPA’s AIM Act rules, refrigerants in new data-center and IT-equipment cooling systems are limited to 700 GWP from January 1, 2027. Ahead of that change, VENTUS set a 2026 target for a wholesale move to a next-generation refrigerant, and the switch to R-454B (GWP about 466, A2L class) is already complete. It is engineered to keep performance comparable to R-410A in the same physical footprint. R-410A models remain available for now.
About the AIM Act: the American Innovation and Manufacturing Act is a U.S. federal law enacted in December 2020. It does two things. First, it phases down the production and import of HFC refrigerants by 85% from the baseline by 2036. Second, under the EPA’s Technology Transitions rule, it sets a global warming potential (GWP) ceiling for refrigerants in new equipment, sector by sector. For data centers, IT-equipment facilities and computer-room cooling, that ceiling is 700 GWP from January 1, 2027. R-410A has a GWP of about 2,088, and R-454B about 466. The rules can be amended, so check the latest EPA notices.
AI-assisted operation · Under active development
VENTUS is actively building AI into Smart Free Cooling. The goal is a system that picks its operating mode by itself from weather and load, and coordinates compressor, fans and valves to use less power for the same cooling. It will trace faults to their root cause, warn before a part needs replacing, recover from minor faults without a technician visit, and keep learning from each site’s own operating data. Every decision is shown with its reasons, and if the AI or communications fail, the system returns to conventional operation so cooling never stops. These are features under development, not released product performance.
Products
Engineered around your site.
Explore cooling capacities, system types, and airflow configurations designed for different installation requirements.
Direct expansion (DX)
Water cooled
Direct expansion
17.6 kW5 tons
- Cooling capacity
- 17.6 kW / 5 tons
- System type
- Direct expansion (DX)
- Airflow
- Up flow
Hover to view products
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support@ventus-i.com
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