Find the world's verified natural refrigerant companies.

At M&M Carnot, now a product line of Johnson Controls, our mission is to cool the world by providing customers with natural refrigeration solutions, systems, and controls that are innovative, safe, and sustainable for people and our planet. Our vision is to create and develop global refrigeration systems across all industries that are respectful of the environment, which include industrial, recreational, commercial, and data centers. We strive to ensure that every client has the option of using natural refrigerants instead of synthetic refrigerants that are harmful to the planet. That’s why we’re committed to eco-friendly refrigerants, including Ammonia, Cascade Ammonia-CO₂, and Transcritical CO₂. M&M Carnot has successfully completed the 2024 ATMOsphere Label process and has been reapproved as a best-in-class natural refrigerant equipment manufacturer for the third year in a row.

Refra is an experienced European manufacturer of sustainable refrigeration and HVACR systems, specializing in advanced cooling and heating solutions using natural refrigerants. Founded in 1994, the company brings over 30 years of engineering and manufacturing expertise and more than a decade of leadership in green cooling technology. Refra designs and manufactures high-quality, safe and energy-efficient refrigeration, air conditioning and heating systems for industrial and commercial applications. The company is known for delivering both standard and fully customized solutions, engineered to meet complex technical requirements and specific customer needs. Green by choice, safe by design Green by choice reflects our deliberate decision to choose natural refrigerants since 2011 — long before environmental regulations made it mandatory. With a strong focus on low-GWP refrigerants such as Propane (R290), CO₂ (R744), Propylene (R1270) and Isobutane (R600a), Refra supports the global transition towards low-carbon cooling. Safe by design represents our approach to quality and reliability. Refra systems are designed to comply with the latest EU F-Gas regulations, EN378 safety standards and demanding efficiency targets — helping customers to make a positive impact on the planet while ensuring reliable, long-term performance in demanding industrial and commercial settings. REFRA has successfully completed the 2025 ATMOsphere Label process and has been approved as a best-in-class natural refrigerant equipment manufacturer for the second year in a row.

Zero-C designs, engineers, manufactures/assembles, installs, and services complete refrigeration solutions as well as broader HVAC (ventilation, air conditioning, heating) and controls for commercial and industrial sites. The company operates as an integrated HVAC&R solutions provider, combining engineering/design, system build/assembly, installation/contracting, controls/automation, and ongoing maintenance/service. It emphasizes low-impact natural refrigerants including CO₂ and ammonia in its solutions. Focus Zero-C targets energy-efficient, “sustainable” cooling and heating projects where heat recovery and energy transfer can reduce overall site energy consumption. Its primary markets include food retail and larger commercial/industrial facilities such as warehouses, processing/cold storage environments, and institutional or sports facilities. The company’s footprint is centered in Canada, with additional entity/location context also referenced for Switzerland. Scope and Products Custom commercial and industrial refrigeration system design/build for customer sites Packaged centralized refrigeration systems (“refrigeration packs”) designed to optimize and distribute energy for refrigeration plus ventilation/AC/heating Heat recovery and energy transfer concepts to improve overall energy efficiency HVAC integration services (ventilation, air conditioning, and heating) alongside refrigeration Control/automation systems for monitoring and optimization Maintenance, after-sales support, and emergency service

Since its establishment in 1987, Nihon Netsugen Systems has been one of the leading companies for large-size heat pumps and industrial refrigeration. In 1999, Nihon Netsugen Systems started a partnership with GEA in Germany. In 2012, Nihon Netsugen Systems began R&D of CO₂ condensing units. The main objectives were to obtain stable operation in hot summer climates and provide energy savings on an annual basis. In 2015, the first CO₂ condensing unit named the “Super Green” was launched in Japanese market. Now Nihon Netsugen Systems is a leading company of CO₂ units in the Japanese market. The main factory is located in Shiga, near Kyoto. The factory always welcomes visitors to share natural refrigerant trends. “We believe in science.” Nihon Netsugen continues to play an active role in achieving SDGs and carbon neutrality by further promoting the Super Green series. Nihon Netsugen Systems has successfully completed the 2025 ATMOsphere Label process and has been approved as a best-in-class natural refrigerant gas manufacturer for the second year in a row.

SCM FRIGO was founded in 1979 and today produces a wide range of refrigeration equipment. Its CO₂ line includes subcritical packs, cascade systems, transcritical chillers and booster systems. SCM FRIGO’s goal is continuous innovation pursued through research, design and production of CO₂ refrigeration systems that are highly sustainable for the environment. All this is made possible by a close-knit team of highly skilled professionals all working toward one end goal. We are natural-born optimists, always striving to become better and better at doing what we believe in. A “NATURALLY” SHARED COMMITMENT SCM believes that, through work, we can help create a more sustainable future. Since 2004, we have worked to develop technologies that use natural gases as refrigerants, thus becoming leaders in the production of CO₂ refrigeration systems. ONE BRAND, MANY SOLUTIONS Natural gas refrigeration systems are our mission, and the main assets of our human resources are enthusiasm, team spirit, initiative, willingness to work hard, and a results orientation. Thanks to this corporate culture, our wide range of condensing units and refrigeration units make SCM FRIGO S.p.A. a unique manufacturer in the European scenario. Core values are all-around customer service, technical expertise, production flexibility and synergy with suppliers. SCM Frigo has successfully completed the 2024 ATMOsphere Label process and has been reapproved as a best-in-class natural refrigerant equipment manufacturer for the second year in a row.

GTS manufactures R290 and R600a natural refrigerants with a sustainable CO₂ footprint, through a distillation plant using R290 HEAT PUMPS and powered by a 1MW solar plant. By reducing our “Scope 3” emissions, we make the world greener and more efficient with GTS refrigerants. GTS, a ‘QUIRIS Holding Industriale’ company, works in the sectors of production and distribution of special, technical and pure gases. GTS carries out its activities in different sectors such as the aerosol industry, refrigeration, construction, food and many other fields. Thanks to its total control of the supply chain of n-butane, isobutane and propane and the exclusive distribution of propylene with a high degree of purity, GTS is a leading company in the production and sale of special gas-based products. GTS produces more than 25,000 tons per year of natural refrigerant gas, including: R290, R600A, R600 and R1270. The company has 5 branches in Italy, Belgium, Romania, Brazil and Thailand, and is able to supply its products all over the world in its own trucks, isotanks and cylinders, to avoid contamination and assure top quality. RANGE OF REFRIGERANT GASES GTS refrigerant gases are divided into specific categories for particular needs, according to their use and sector of application. Polarpure R600A refrigerant gas. GTS pure isobutane is used primarily for domestic refrigeration (fridges and freezers). The product is also suitable for particular applications such as LNG plants, power stations etc. Polarpure R290 refrigerant gas. GTS pure propane is the most widely used product in air conditioning systems, in commercial freezers and fridges, in ice-making machines, in bottle fridges, in vending machines and in cascade refrigeration systems for supermarkets, etc. This gas is the best ecological alternative to environmentally harmful R134a. Polarpure R1270 refrigerant gas. GTS polymer-grade propylene (99.5%+) is also used as a refrigerant. Polarpure R433A, R433B, R433C refrigerant gas. GTS polymer-grade pure propane and propylene (99.5%+) mixtures are used as refrigerants. Polarpure R600 refrigerant gas. GTS pure n-butane can be used alone or as a component in a mixture. GTS S.p.a. has successfully completed the 2025 ATMOsphere Label process and has been approved as a best-in-class natural refrigerant gas manufacturer for the second year in a row.

OLAB S.r.l. is an Italian manufacturer of fluid-control and refrigeration components, supplying engineered parts designed to improve safety, reliability, and serviceability of refrigeration circuits. The company develops and produces valves, solenoids, fittings, and related components for OEMs and system builders, emphasizing certified, leak-tight solutions (including its “OLAB Ecosystem” of UL-certified, weld-free, helium-tested components). OLAB positions itself as a specialist for natural-refrigerant refrigeration, particularly CO₂ (R-744), and also targets applications using flammable refrigerants by safety class. Focus OLAB primarily serves the refrigeration and broader fluid-control markets where hermetic performance, high-pressure capability, and reduced leak risk are critical—especially in modern low-GWP systems. Its product messaging emphasizes transcritical/high-pressure CO₂ refrigeration as well as component suitability for A1/A2L/A3 safety classes, supporting the industry shift toward natural and other low-GWP refrigerants. The company’s footprint is centered in Italy (Torbole Casaglia, BS), serving customers from its domestic manufacturing base. Scope and Products CO₂ (R-744) high-pressure components (stated capability up to 150 bar / 2175 psi) for subcritical and transcritical systems Solenoid valves (including direct-acting and servo-controlled piston solenoid valves) Ball valves (2-way/3-way, flanged, rotalock, shut-off) Check valves Receiver / charge-discharge valves Dehydrator filters for transcritical systems Fittings and connection solutions (e.g., Fastlock CO₂, manifolds) “Weld-free” connection systems aimed at faster/safer installation and maintenance Broader fluid-control offerings (valves, solenoids, pumps, and fittings for other industrial uses)

Zudek is a company based in Trieste, Italy, that designs, engineers and manufactures energy-efficient industrial refrigeration solutions using only natural refrigerants, in most cases ammonia. The products come as compact, plug and play, low charge units, very easy to transport, install and start up. Its range of products comprises of: – Water/ammonia absorption chillers, where heat is recovered to produce precious subzero cooling power down to temperatures of -60 °C; – Ammonia air-cooled and water-cooled chillers working with vapour compression refrigeration cycles; – Ammonia heat pumps that can reach temperatures of +90 °C, promoting industrial electrification and decarbonisation policies; – Ammonia abatement systems (scrubbers) that can be integrated on the units or remotely installed next to an existing refrigeration plant; – Electrical control panels, pressure vessels, metal carpentry, connection lines, pumping skids, etc. Zudek solutions are suitable for industrial, civil and commercial applications, having its main references in the food and beverage industry, but also in HVAC applications, and other industries such as plastics, pharmaceutical, chemical and deep freezing ones. All Zudek’s units are remotely managed 24/7 from Zudek’s remote control room, which allows to constantly optimise the operational parameters of the unit, to guarantee the highest energy efficiency and energy savings. Zudek’s solutions are available according to PED or ASME codes. The company is certified ISO9001:2000 by the SGS institute. ZUDEK has successfully completed the 2025 ATMOsphere Label process and has been reapproved as a best-in-class natural refrigerant equipment manufacturer for the fourth year in a row.

TEKO has been successfully active in refrigeration technology for over 40 years and offers innovative refrigeration solutions for food. Based on its many years of experience in food refrigeration, the company has specialized in standardized series products for various applications for the cooling of fresh goods. This includes retailing, logistics, food production and commercial refrigeration. TEKO offers multi-compressor systems, high-quality refrigeration components from exclusive partner companies and control electronics from Wurm Systeme and combine this with the broad range of specialist expertise and in-depth product knowledge of our qualified and dedicated employees. This way, the company’s customers receive a fully integrated package meeting the highest standards from a single source: Well-grounded solutions, reliable systems “Made in Germany”, perfectly adapted components and a comprehensive control system with software packages – rounded off by suitable training courses for refrigeration companies and operators. TEKO offers original equipment manufacturers a wide range of high-quality “just in time” refrigeration components. The company’s main focus is on innovative and future-proof refrigeration systems with natural refrigerants. It has been intensively involved with the natural refrigerant CO₂ since 2004 now and already have several thousand proven CO₂ systems on the market, operated by convinced customers. As an internationally active company, TEKO is represented by subsidiaries and affiliates in Europe and Asia. For the Asian market, we manufacture the refrigeration units – developed and designed in Germany – locally in Bangkok / Thailand. TEKO Refrigeration has successfully completed the 2024 ATMOsphere Label process and has been reapproved as a best-in-class natural refrigerant equipment manufacturer for the third year in a row.

Expert in hydrocarbon chillers Secon specialises in integral systems for environmentally friendly and energy efficient refrigeration. Chillers employing natural refrigerants are the main focus, especially hydrocarbons. Secon was founded in 2010 aiming to manufacture chillers solely on the basis of natural refrigerants and pioneered the use of hydrocarbons. Throughout the German-speaking region, Secon has proven to be an innovating force of this expanding market segment. Thanks to its project-specific design premise and flexibility to individually adapt each machine, Secon is always the first choice when it comes to quality and efficiency. Furthermore, each Secon manufactured unit is provided with a comprehensive and tested safety concept that ensures the safe use of flammable refrigerants. Innovation and sustainability Energy efficiency as well as minimal environmental impact, down time and life cycle costs are the top design criteria for the products. Secon thus, without exception, uses natural refrigerants such as propane (R290), propene (R1270) and Isobutane (R600a). Secon also offers subcritical CO₂ (R744) refrigeration systems and machines with air cycle technology (R729). Present-day awareness of the harmful implications of synthetic refrigerants makes imperative that they may only be employed where no viable alternative technologies with natural refrigerants are yet available. Secon defines as its entrepreneurial responsibility to minimise the consequences of refrigeration technologies for the environment and future generations, therefore manufactures its products for the most environmentally friendly and safe use as possible. For Secon, this comprises to consistently contribute through research and state of the art technological development. Choice of refrigerant mainly depends on project-specific application and installation location. Hydrocarbons have no ozone depletion potential (ODP = 0) and negligible global warming potential (GWP < 1). There is a near-unlimited supply, they are cost-effective and absolutely future-proof. Hydrocarbon refrigerants are synonymous with high energy-efficiency which contributes to the reduction of operational costs and indirect CO₂ emissions. Hydrocarbons are used safely with the appropriate plant system design. Secon‘s products‘ safety standards are recognised in current norms and technical guidelines. Secon was one of the first companies to develop production-ready hydrocarbon chillers and enter the market. Its engineering consistently aims to reduce refrigerant charge sizes. Secon is one of the few companies to offer chillers with up to four separate refrigerant circuits. The safety concept is developed in house an applied to all chillers with flammable refrigerants; it ensures safe plant operation for the whole range of applications. For Secon, it is not just a phrase to consistently further technological development but a self-evident premise for success. Secon offers significantly more than outstanding products. Facilitating a project-specific design process, Secon consults its customers throughout the early phases of planning and integral system design, e.g., on how to approach safety, hydraulic implementation and application for government financial assistance. After-sales customer support of Secon is provided for commissioning as well as regular service and maintenance. SECON has successfully completed the 2024 ATMOsphere Label process and has been reapproved as a best-in-class natural refrigerant equipment manufacturer for the third year in a row.

Fenagy is a leading manufacturer of industrial heat pumps and cooling systems. Our vision is to help the transformation of the energy system into a greener and more sustainable one. We have two focus areas: the district heating sector, where our electrical heat pumps prevent the burning of fossil fuels, and the industry, where our combined heating and cooling systems reuse all waste energy. Our systems only use natural refrigerants, CO₂ and hydrocarbons, and with these, we cover a broad range of applications. We are constantly developing new solutions and services that play an active role in future energy systems, based on power from renewable energy sources, such as solar and wind. This puts great demands on the power grid and thus also on electricity-consuming devices, which must be able to react fast – and this is exactly what Fenagy machines can. We are also looking into a future where it will be legally required or a social norm not to release valuable waste heat into the environment if it can be utilised. But what about waste cooling? At Fenagy, we aim to utilise both the cooling and heating capabilities of our solutions, either separately or in combination. Fenagy is an OEM, but also a project-oriented company that secures professional and close cooperation with our partners. FENAGY has successfully completed the 2025 ATMOsphere Label process and has been reapproved as a best-in-class natural refrigerant equipment manufacturer for the third year in a row.

Vahterus is a Finnish family business founded in 1990. We are the inventor, pioneer and market leader in Plate & Shell Heat Exchanger technology. Our heat exchangers are built for the next generation: they save energy, are compact in size, always custom-made, and because of their fully welded structure, they’re durable enough for even the most demanding conditions. We aim to maintain our position as forerunners in our field through continuous product development, automated production technology and strong application know-how. A significant part of our research and development is done together with our customers, finding solutions to each unique requirement. Several global patents and awards granted for our innovative design and environmentally friendly products are a token of the success of our work. With headquarters and manufacturing facilities in Finland and subsidiaries in the UK, Germany, China and the US, we currently employ more than 350 people globally. Vahterus has brought many innovations to the refrigeration industry and remains active in developing new solutions for the future. Our focus is on applications that use natural refrigerants, where fully welded plate & shell heat exchangers are the perfect fit. We work closely with the world’s leading chiller manufacturers to develop customised products and entire product ranges. As heat recovery is becoming more and more important in the fight against global warming, we have developed new technologies for the growing market of heat pumps. Vahterus Plate & Shell Heat Exchangers have a fully welded construction and low refrigerant charge, which guarantees maximum safety. Their compact design saves space and because there are no gaskets, units are low maintenance and easy to clean. Applications Evaporators Combined (Evaporator with integrated separator) Droplet separators Cascades Desuperheaters Oil coolers Subcoolers Condensers Key solutions Chillers Heat pumps Absorbtion plants Transcritical solutions VAHTERUS has successfully completed the 2024 ATMOsphere Label process and has been approved as a best-in-class natural refrigerant equipment manufacturer.

Güntner is a globally recognized leader in heating and cooling solutions, with over 90 years of engineering expertise. Headquartered in Munich, the company plays a vital role across various industries: from preserving food and regulating building temperatures to enabling renewable energy systems. Güntner’s approach blends everyday technical precision with a strong vision for the future, rooted in innovation and adaptability. The company specializes in high-performance heat exchangers, including air coolers, condensers, dry coolers, and gas coolers, designed for efficiency and durability in demanding applications. Sustainability is a core principle for Güntner. The company is deeply committed to environmental responsibility, integrating renewable energy and efficient water treatment systems across its manufacturing facilities. Its unique “Planted Plant” concept—bringing greenery into industrial workspaces — reflects a broader goal of creating healthier, more balanced environments. All Güntner systems are designed to operate with minimal energy and water consumption, helping to protect natural resources and reduce environmental impact. With a presence in over 50 locations and six manufacturing sites worldwide, Güntner combines global reach with local responsiveness. Its expert teams deliver highly customized solutions tailored to the specific needs of each partner, fostering long-term collaboration and trust. Through engineering excellence and a steadfast commitment to progress, Güntner continues to shape the future of thermal management and sustainable cooling technologies.