While HVAC systems are central to comfort, safety and indoor air quality, refrigerant gas leaks are a key driver of whole-life carbon emissions in modern buildings. Shaun Evers, managing director of Stonegate Instruments, explains the impact of gas leaks and how smart gas detection technology can help.

Heating, ventilation and air conditioning (HVAC) systems are one of the largest consumers of electricity and, if not properly maintained, can become a significant threat to people, profit, and the planet. Should they develop a leak, the release of toxic gases can endanger building occupants and cause operational and environmental damage.

Research from The Carbon Trust indicates that the average UK system loses around 20% of its gases each year, which requires it to use 11% more energy to maintain capacity. Often, leaks are not detected until 60% of gas has escaped, meaning operators could be paying an additional 33% in energy costs to keep the system operational. In this sense, refrigerant gas leaks are one of the major contributors to energy inefficiency. The carbon impact of this wasted energy feeds directly into whole-life emissions.

However, the impact of gas leaks extends far beyond system inefficiency. Globally, refrigerant-related emissions from HVAC systems alone add an estimated 720 million tonnes of CO2-equivalent to the annual carbon footprint. In 2022, these systems accounted for 3.2% of all greenhouse gas emissions when factoring in both energy use and refrigerant loss. Because refrigerants have such high global warming potential (GWP), even small leaks can disproportionately increase a building’s whole-life carbon total, undermining decarbonisation strategies and net-zero ambitions.

Leaked HVAC gases are also harmful to people. Those who are exposed can suffer from skin and eye irritation, coughing, headaches, breathing difficulties, nausea and vomiting. In confined spaces, higher concentrations can lead to unconsciousness and even suffocation. A major challenge is that these gases are typically colourless, odourless and tasteless, making them undetectable without specialist equipment.

Technology-led gas detection

Given the environmental and safety risks, minimising gas leaks should be a top priority in any environment where HVAC systems are used. While regular maintenance is essential – leaks often develop through corrosion, vibration, or poor-quality installation – proactive monitoring, supported by modern gas detection technologies, can identify issues before they escalate.

Recent developments in self-contained gas sensors have made it easier and more cost-effective to identify and repair leaks quickly. Using semiconductor or infrared sensing elements, the latest detectors can accurately identify both HVAC and non-HVAC gases. These systems can even be programmed with pre-defined mixtures of gases and air, allowing their sensitivity to be tailored to specific environments.

Modern sensors come equipped with LED indicators and audio-visual alarms to alert facilities teams as soon as a leak is detected. They can also be integrated with building management systems to trigger automated responses.

By enabling leaks to be addressed quickly, the savings on energy costs alone can provide a return on investment within two years. Some systems also use active filters to omit irrelevant gases from detection, further extending sensor life and reducing maintenance costs.

This proactive approach delivers long-term environmental value, reducing the cumulative climate impact of both refrigerant leaks and increased energy use.

Proactively protecting people and planet

Functional and efficient HVAC systems are a fundamental requirement in many environments, but the risks these systems pose to people, profit and the planet are significant. On the journey to net zero, HVAC management is an essential, yet often overlooked, element.

Smart gas detection technology offers a proactive step towards ensuring safety and supporting sustainability by protecting building occupants from exposure to refrigerant gases, reducing inefficiency and energy wastage, enhancing system performance, and significantly cutting carbon emissions. For building owners and operators, investing in reliable detection systems is not only a safety decision, but a critical step in creating resilient, low-carbon facilities.

About Stonegate Instruments

Stonegate Instruments Ltd designs, develops and manufactures electronic equipment for the refrigeration industry. Their products have been proven to reduce energy usage, greenhouse gas emissions and associated costs in cold storage facilities. For more information about the latest technology available, contact Stonegate Instruments on 0113 224 4440, or email sales@stonegate-instruments.co.uk.

http://www.stonegate-instruments.com/

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