Leak Testing in HVAC/R: Meeting Quality, Environmental, and Safety Standards
Growing requirements for environmentally friendly and energy-efficient products.
Today, several key drivers are shaping how leak detection is approached across the HVAC/R industry. From stricter energy-efficiency standards and the push for energy-efficient HVAC systems to higher expectations around HVAC/R product quality control, environmental responsibility, and safety compliance, these factors are redefining production requirements. Understanding these drivers is essential for manufacturers aiming to stay competitive while delivering high-quality, compliant, and future-ready HVAC/R products.
Stricter energy efficiency standards
For years, the trend in the HVAC/R sector has been towards greater energy efficiency and more environmentally friendly products. Since 2021, all refrigerators must be labeled with the new EU energy label, which is based on the new, stricter energy efficiency classes A–G. However, more energy-efficient systems usually consist of smaller, more complex parts where leak detection is more difficult. Even the smallest leak can compromise system performance and efficiency, making reliable testing essential.
As energy efficiency standards tighten worldwide, manufacturers must ensure that every component meets strict performance criteria. Advanced leak detection is no longer optional—it has become a fundamental part of design and production processes. This focus not only supports compliance but also helps companies differentiate themselves in a highly competitive market.
Better product quality and reliability
When it comes to finding and implementing the most sensible, quality-assuring, and cost-effective leak detection method for a specific application, manufacturers and suppliers should always keep an eye on the cost–benefit ratio. The selection never depends solely on the limit leak rate against which the leak tightness of a component or system is to be tested. Factors such as automation capability, speed, and reliability of the test always play a role.
Reliable leak detection ensures consistent performance throughout the product lifecycle, reducing warranty claims and costly field failures. Incorporating automated and reproducible testing methods allows manufacturers to scale production without compromising quality, giving them a competitive edge.
Why are natural refrigerants like R290 and R600a gaining popularity?
The effect on the climate and high greenhouse gas potential of fluorinated refrigerants have prompted the European Union to gradually ban their use. The most recent amendment to Regulation (EU) 2024/573 on fluorinated greenhouse gases (known as the F-Gas Regulation) came into force on March 11, 2024. The Global Warming Potential (GWP) of the gases is decisive for the different prohibition levels in the regulation. These bans are acting as an impetus for change in the refrigeration and air conditioning industry and are a key driver for achieving greater environmental compatibility. For example, the previously ubiquitous R134a with its GWP of 1430 (expressed in CO2 equivalents) will disappear completely sooner or later.
Previously neglected refrigerants with a lower GWP, on the other hand, are gaining ground in the industry—such as R744 (CO2), R600a (isobutane), and R290 (propane). The GWP value of CO2 is by definition 1, while that of the other two natural but flammable refrigerant gases is 3. All of these changes can also influence the requirements for the leak tightness of relevant components and the selected test methods.
What safety and regulatory requirements apply to leak detection in HVAC/R systems?
Alternative gaseous refrigerants from R290 (propane) to R600a (isobutane) are becoming increasingly popular both for environmental reasons and because of the regulatory provisions of the F-Gas Regulation. However, these natural refrigerants pose new challenges on production lines because they are highly flammable. Natural refrigerant gases fall under the EU's ATEX regulation (ATEX = Atmosphères Explosibles) as well as the U.S. standard NEC Art. 501. The ATEX Directive 2014/34/EU contains uniform regulations for the sale and commissioning of devices and protective systems in potentially explosive atmospheres that apply to the entire European Union.
ATEX Zone 2 refers to an area in which an explosive atmosphere consisting of a mixture of air and flammable gases, vapors, or mists normally occurs only briefly or not at all—i.e., for less than 10 hours over the entire year. It can be assumed that the production lines of cooling systems using natural hydrocarbon refrigerants will be classified as ATEX Zone 2. Consequently, specific regulations apply: operators are obliged to carry out a risk analysis and declare corresponding areas of production as Ex zones. The explosion protection measures required there include only using equipment with reliable explosion protection. For electrical equipment and other potential ignition sources, this implies that they must be designed in such a way that they cannot cause an explosion even if unexpected events occur. Accordingly, special safety measures must also be observed during leak detection processes in ATEX Zone 2, for example, during end-of-line tests on products that are ready for operation. INFICON has developed a special sniffer line called SL3000EX specifically for sniffer leak detection in these areas. It is certified for use in ATEX Zone 2 environments as well as for use in hazardous areas in accordance with NEC 501 Class 1, Division 2. This sniffer line removes all electrical components of the leak detection system from the hazardous environment.
Ensuring safety is not only a legal requirement—it protects employees, production lines, and end-users. Using certified leak detection tools in hazardous zones demonstrates a commitment to workplace safety while maintaining operational efficiency.
The industry impact
The air conditioning industry will be forced to change in the coming years. The EU's F-Gas Regulation and the Aim Act (USA) have already severely restricted the use of some of the refrigerants commonly used to date, such as R404A and R507; from 2030, it will also no longer be permitted to refill existing systems with them. Similar regulations are also being implemented in China. However, even many refrigerants with a GWP that is within the legal limits still have a high global warming potential. In addition to the regulatory framework, it is also the increasing environmental awareness of manufacturers and consumers that is driving the trend towards environmentally friendly refrigerant gases. Natural refrigerants such as R290 (propane), R600a (isobutane), R717 (ammonia), and R744 (CO2) are establishing themselves on the market as more climate-friendly alternatives. These may entail new requirements for leak tightness and leak testing.
The growing focus on energy efficiency and climate protection is also playing an increasingly important role in heating systems. Here too, the F-Gas Regulation has prompted heat pump manufacturers to replace traditional refrigerants such as R410a, R134a, and R407c that have high GWP values with natural refrigerant gases. In addition, global energy consumption is constantly increasing, which brings with it new challenges. Because heating systems are among the systems that consume the most energy, boilers have also had to carry energy efficiency labels since 2015. The requirements relating to the quality and safety of heating systems are also constantly increasing. If water escapes from a heating circuit or coolant leaks from a heat pump, this indicates that the heating equipment no longer works properly and effectively—which in turn can lead to costly recalls that can damage the reputation of a manufacturer.
In a rapidly evolving market, leak detection has become a strategic differentiator. Manufacturers who proactively adopt modern methods not only reduce risk and ensure compliance but also strengthen their position as leaders in sustainable and high-performance HVAC/R solutions.
Are you a manufacturer of refrigeration or heating systems?
Leak detection and leak testing in industrial production is always about finding the ideal compromise between quality assurance on the one hand and effort and cost on the other.
Download our e-book for a comprehensive overview of all leak‑testing methods, including practical guidance, comparisons, and expert insights.
Download Our Free E-Book
Service Tools for HVAC/R
We offer a full line of products for both residential and commercial HVAC/R service, including A2L-certified leak detectors, durable refrigerant charging scales, and more. For a closer look at INFICON tools for HVAC service, please visit our HVAC/R tools page here.
