STULZ

What STULZ does

STULZ GmbH is a German, family-owned manufacturer of precision air conditioning and cooling solutions for mission-critical applications, headquartered in Hamburg and founded in 1947. The company designs and builds precision cooling systems spanning room cooling, high-density and rack-based cooling, liquid cooling (including the CyberCool CMU refrigeration distribution unit and modular offerings via STULZ Modular), air handling units (CyberWall, CyberHandler Custom), chiller and free-cooling units (CyberCool Free Cooling Booster), micro data centers, telecom shelter cooling, humidifiers, and proprietary monitoring/control systems (SEC.blue and C100). Underlying technology includes direct free cooling, liquid cooling for HPC/AI workloads, immersion cooling capability (via the Asperitas partnership), and proprietary control IP supporting Modbus/BACnet BMS integration, with CFD analysis and dedicated test centers used to engineer site-specific configurations.

The business model is hardware-led B2B with an aftermarket services and spare-parts tail. Revenue is generated through quoted sales of cooling units and chillers to enterprise customers, complemented by technical services (CFD simulations, customized advice, commissioning), maintenance contracts, and an online spare-parts e-Shop. Distribution combines direct enterprise field sales through 35 wholly-owned subsidiaries and 10 regional production sites (Hamburg, Spain, Shanghai, Frederick MD, plus a recently expanded Hamburg liquid cooling line) with a channel-partner network of trained and certified service providers in over 140 countries. Pricing is quote-based and not publicly disclosed.

Primary customer segments are data centers (hyperscale, colocation/cloud, and enterprise), telecom infrastructure operators, and adjacent industrial and institutional verticals including finance, healthcare, government, education, broadcasting, and manufacturing. STULZ has been ranked a top-3 global data center cooling supplier (DCNN, 2023), is consistently listed among key players alongside Vertiv, Schneider Electric, and Rittal, and counts ~8,200 employees across 35 subsidiaries worldwide. The Stulz family retains ownership through directors Jürgen Stulz, Marc-Oliver Stulz, and Christoph Stulz, plus Thorsten Weiss.

Name

STULZ

Legal name

STULZ GmbH

Website

https://stulz.com

Company type

Private

Founded year

1947

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

STULZ is a German family-owned manufacturer of precision air conditioning and cooling solutions for data centers, telecom infrastructure, and mission-critical facilities, serving customers in 140+ countries through 35 subsidiaries and 10 production sites.

Ownership category

akta.pro rank

Product category

Data Center Cooling & Precision Air Conditioning

NAICS

Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing (333415), Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing (33341), Industrial and Commercial Fan and Blower and Air Purification Equipment Manufacturing (333413)

SIC

Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585), Industrial & Commercial Fans & Blowers & Air Purifing Equip (3564)

akta.pro primary industry

Cooling Systems & Thermal Management (CRAC/CRAH, Chillers, Liquid Cooling) (HDABAKAD)

akta.pro secondary industries

Pump & Compressor Packages (Skids, Booster Sets) (IMAHANAG), Pneumatic Air Preparation & Distribution (FRL assemblies, manifolds, air headers) (IMAHAGAD)

Keywords

• Precision air conditioning
• Data center cooling
• Liquid cooling solutions
• Free cooling systems
• Industrial HVAC chillers

Headquarters

HQ city

Hamburg

HQ country

Germany

HQ region

Europe

Offices26 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Technology or R&D, Infrastructure, Marketing or Sales

Revenue model

1. Precision Air Conditioning Units: Sale of cooling and air conditioning units for data centers and mission-critical applications including room cooling, high-density cooling, liquid cooling, air handling units, chiller units, and micro data centers.
2. Industrial HVAC Systems: Climate control solutions for industrial applications including telecommunications infrastructure (shelter cooling), manufacturing, and other sectors.
3. Services and Maintenance: Technical service, maintenance contracts, customized advice, CFD simulations, test center services, and implementation support provided through global subsidiary and partner network.
4. Spare Parts and E-Commerce: Online sales of spare parts through STULZ e-Shop platform.

Go-to-market motion3 records

Distribution channels5 records

Marketing channels8 records

Core offering

STULZ manufactures and sells precision air-conditioning units, chillers, free-cooling modules, liquid-cooling systems, air handling units, micro data centers, humidifiers, and shelter cooling products for data centers and mission-critical applications. The portfolio spans standard units through fully customized configurations, supported by global production, CFD-based engineering, proprietary control systems, and worldwide service/maintenance through subsidiaries and partners in over 140 countries.

Product overview

STULZ is a leading global provider of precision air conditioning and cooling solutions for mission-critical applications and data centers with over 50 years of experience. The product portfolio is organized into core product categories including Room Cooling, High-density and Rack-based Cooling, Liquid Cooling, Micro Data Centers, Air Handling Units (including the CyberWall and CyberHandler Custom lines), Chiller Units (including the CyberCool Free Cooling Booster), Monitoring systems (with proprietary SEC.blue and C100 controllers), Shelter Cooling (including CabinetAir PRT), and Humidifiers. Products range from standard units to fully customized solutions following the 'Climate. Customized.' philosophy. STULZ operates 35 subsidiaries with 10 production sites across America, Africa, Asia, Europe, and Oceania, and has been recognized as a top global data center cooling supplier.

Differentiator

Problem solved

Functional benefit

Brands

• CyberAir: Precision air conditioning product line for data centers
• CyberCool
• CyberWall
• CyberHandler
• CabinetAir
• ShelterAir
• WallAir
• TelAir
• SplitAir
• Explorer
• SEC.blue
• C100

Products and services

• CabinetAir PRT Outdoor cabinet cooling unit with Direct Free Cooling designed for telecommunications cabinets and shelters; provides 1–2 kW of energy-efficient and noise-optimized cooling with an optional 48V DC backup for power-failure scenarios.
• CyberWall Indoor Air Handling Unit Wall-mounted indoor air handling unit for large and hyperscale data centers that does not require a raised floor; the Standard version provides 185–683 kW cooling capacity with optimized air distribution, while the Custom variant delivers tailored configurations.
• CyberCool Free Cooling Booster Free cooling module add-on for water-cooled chillers that uses low outdoor temperatures to deliver energy savings of up to 210,000 EUR per year (Hamburg climate profile); capacity range 270–1,800 kW with three operating modes and plug-and-play installation for retrofits.
• CyberCool CMU Refrigeration Distribution Unit Liquid-cooling refrigeration distribution unit for high-performance computing and AI-driven data centers, manufactured at the Hamburg headquarters and shipped to customers across EMEA and the US.
• CyberHandler Custom Air Handling Units Custom air handling units with flexible configurations tailored to individual data center or industrial cooling requirements, part of STULZ's customized-solutions portfolio.
• CyberAir 3PRO CW Precision cooling unit using a chilled-water (CW) system for temperature and humidity control in data center environments.
• CyberAir 3PRO DX Precision cooling unit using direct expansion (DX) for data center temperature control, suited to installations without chilled-water infrastructure.
• Room Cooling Systems Precision air conditioning systems designed for data center and server room environments to maintain optimal temperature and humidity levels.
• High-Density and Rack-Based Cooling Cooling solutions engineered for high-density computing environments and rack-based cooling applications, including solutions for HPC and AI workloads.
• Liquid Cooling Solutions Advanced liquid cooling solutions for high-performance computing and AI-driven data centers requiring efficient thermal management.
• Micro Data Center Compact, self-contained data center solutions for edge computing and distributed IT infrastructure deployments.
• Chiller Units Industrial chiller systems for data center cooling applications, including free-cooling-capable units such as the CyberCool Free Cooling Booster.
• Humidifiers Humidification products for precise humidity control in data center and mission-critical environments, integrated into STULZ cooling systems.
• STULZ CFD Simulations for Data Centers Computational Fluid Dynamics (CFD) analysis service that models airflow and temperature distribution in customer data centers to optimize cooling system design and configuration.
• STULZ Test Center Services Test center services at STULZ facilities (notably the 40,000 m² Esquivias site in Spain) for validating cooling equipment performance under real-world conditions before deployment.
• STULZ e-Shop Spare Parts Online e-commerce platform selling genuine STULZ spare parts for installed cooling systems, available 24/7 for existing customers.

Quantifiable outcome

• Energy savings up to 90% with Direct Free Cooling technology
• +3 more outcomes

Named customers8 records

Segments8 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

One partnership is on record.

• AsperitascoreStrategic or Co-development Partner · 1 May 2024Partnership between Asperitas and STULZ Modular for liquid cooling technology. This collaboration combines Asperitas's immersion cooling expertise with STULZ's global cooling solutions portfolio, targeting high-performance computing and AI-driven data center markets.

Scale indicators11 records

Recent moves7 records

Expansion highlights6 records

Broad incumbents

• Johnson Controls:
• Schneider Electric: Schneider Electric is a global digital transformation provider offering integrated data center infrastructure including cooling (Uniflair), power, racks, and DCIM software. Competes with STULZ across data center cooling and is consistently cited alongside STULZ as a key market player, though Schneider offers a much broader portfolio beyond thermal management.
• Trane Technologies: Trane Technologies is a global climate innovator offering HVAC, chillers, and thermal management for commercial, industrial, and data center applications. Competes with STULZ in data center chillers and cooling, particularly for large enterprise facilities, though Trane's primary focus spans broader commercial HVAC markets.

Direct peers

• Vertiv Holdings: Vertiv is a leading global provider of critical digital infrastructure including precision cooling, power management, and IT management for data centers. Direct competitor to STULZ in precision air conditioning and liquid cooling for hyperscale, colocation, and enterprise data centers, with comparable product breadth across CRAC/CRAH, chillers, and liquid cooling systems.
• Airedale (by Trinity Group): Airedale, part of the Trinity Group, designs and manufactures precision air conditioning and chilled water systems for data centers and process cooling. Direct competitor to STULZ in CRAC/CRAH units, chillers, and free cooling solutions, particularly in European and emerging markets, often listed alongside STULZ in industry analyses.
• Rittal: Rittal (a Friedhelm Loh Group company) provides IT infrastructure including IT cooling solutions, server racks, and enclosures for data centers. Competes with STULZ in liquid cooling systems and IT cooling, with comparable products for edge and hyperscale deployments, and is frequently listed alongside STULZ as a key player.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• YouTubeyoutube.com/channel/UCY6K6LzBf5TMmBUFNMa7vZQ
• LinkedInlinkedin.com/company/stulz-global
• Facebookfacebook.com/Stulz.Global

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Subsidiaries27 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about STULZ