Tom Houlker, experienced HVAC engineer and the director of Houlk Air, stresses why contractors and construction workers must stay ahead of UK refrigerant changes for efficient works
Refrigerant selection has traditionally been a routine part of HVAC design. Most contractors have worked with the same gases for years, with a reliable supply and well-understood installation methods. That position is now shifting.
The problem is this. Too many projects are still being designed around refrigerants that are actively being phased out. The assumption that compliance is a future concern is leading to decisions that may not hold up over the long term. As UK F-Gas targets tighten, supply is shrinking, and certain gases are already becoming harder to source.
This creates real risk. Systems being specified today may become more expensive to maintain as refrigerants become harder to source, with some facing pressure to be replaced sooner than expected. With the UK targeting a 79% reduction in fluorinated gases by 2030, the transition is no longer theoretical.
What refrigerant changes are happening in the UK?
The UK is actively reducing reliance on fluorinated gases with high global warming potential. These synthetic refrigerants, widely used in cooling systems, can have a significantly greater impact on greenhouse gases than carbon dioxide when released into the atmosphere.
The UK F-Gas framework is driving this transition. It sets a phased reduction in hydrofluorocarbons based on carbon dioxide equivalent. The R4110a systems are also being phased out and replaced by R32 systems. This is because the older systems require more refrigerant. This is only one example of the reductions being implemented, with further proposals suggesting even more changes in the years ahead.
It’s key to highlight that this is not a single ban. Instead, it is a gradual supply restriction, combined with targeted limits on high-GWP refrigerants in new equipment. As a result of this:
- High GWP options are becoming less viable for new installations
- Servicing older systems is becoming more expensive
- Supply shortages are increasing pressure across the market
Existing systems can still operate and, in many cases, be maintained. However, reduced availability means even routine servicing may become more costly over time.
The UK is seeing the emergence of Hybrid HVRF (Hybrid Variable Refrigerant Flow) Systems, which combine traditional VRF refrigerant technology with water-fed fan coils inside the building. This system is starting to filter into buildings in the UK, with the expectation that it will be much more prominent in the years to come. This is an example of how systems are evolving in response to changes in the air conditioning industry.
Pricing is shifting in a way that often goes unnoticed. As quotas are reduced, the cost of high-GWP refrigerants is rising faster, with refrigerants like R410A and R404A seeing price increases of around 17-21% year-on-year. This is already putting pressure on maintenance budgets and shaping how businesses approach system upgrades.
Why low GWP refrigerants are changing system design
Switching to lower GWP refrigerants is not a simple replacement exercise. It introduces new technical considerations that directly affect how systems are designed and installed.
Many modern alternatives fall into categories that include mildly flammable properties. This changes how contractors must approach installation and safety planning. It is no longer just about performance or efficiency. Refrigerant characteristics now influence wider project decisions.
System design must account for factors such as:
- Refrigerant charge limits
- Ventilation requirements
- Equipment positioning
- Leak detection and risk assessment
These are practical challenges, not theoretical ones. For example, a system using a mildly flammable refrigerant may require different placement or additional safety measures compared to traditional synthetic refrigerants.
Another key shift is happening earlier in the design process. Refrigerant choice now has implications for building layout and coordination with other systems. Waiting until later stages to address this can lead to redesign or increased costs.
There is also a performance benefit to consider. Many low-GWP refrigerants improve efficiency, leading to lower energy consumption over time. Some low-GWP refrigerants are shown to deliver efficiencies up to 5-6% higher than those of high-GWP refrigerants. While initial installation costs may increase, long-term operating savings can offset that difference.
How refrigerant changes are affecting site projects
The impact of refrigerant changes is already visible on active projects. Contractors are dealing with issues such as increased complexity, tighter compliance requirements, and shifting client expectations.
Installation practices are evolving. Systems using newer refrigerants often require updated handling procedures and closer coordination with other trades. This can affect timelines and increase the need for detailed planning. For example, when installing a split air conditioning system using a mildly flammable A2L refrigerant, contractors may need to coordinate with electrical and fire safety teams to ensure appropriate ventilation and safe unit placement.
Consultants are also under pressure to think beyond immediate compliance. Specifying a system based on current regulations alone is no longer enough. Future availability needs to be considered, along with servicing requirements and lifecycle performance.
From a commercial standpoint, the risks are becoming clearer. High GWP refrigerants are not just an environmental concern but also a supply issue. As the refrigerants become harder to source, costs increase, and maintenance becomes less predictable.
One insight that is often missed is how refrigerant selection can influence asset value. Buildings with HVAC systems that use refrigerants may incur higher operating costs. This can account for 40-60% of a building’s total energy consumption. When the figures are this high, it shifts refrigerant choice into a broader investment conversation.
Why skills and training are becoming a limiting factor
The transition to new refrigerants is not just technical. It is also a workforce challenge.
Handling modern refrigerants, particularly those that are mildly flammable, requires new training and certification. Engineers must understand new safety procedures, recovery methods, and system behaviours. This is closely monitored under UK gas regulation frameworks and enforced by bodies such as the Environment Agency.
The issue is that demand for these skills is rising faster than supply. As more projects adopt low-GWP refrigerants, the need for trained engineers is increasing. At the same time, not all contractors have fully adapted to these requirements.
This creates a potential bottleneck. Projects may face delays if qualified personnel are not available. Maintenance could also become more difficult if systems require specialist knowledge.
There is also a broader implication for businesses. Companies that invest in training will be better positioned to take on future work. Those who do not may find themselves limited in the types of systems they can install or maintain.
Staying ahead of the shift
Refrigerant changes in the UK are already reshaping the way cooling systems are designed and delivered. The move away from high-GWP refrigerants is driven by the need to reduce greenhouse gas emissions, but its impact extends far beyond environmental compliance.
System design, installation practices, and long-term maintenance are all being affected. Refrigerants that were once standard are becoming harder to source, while newer alternatives are introducing different safety and design requirements.
For contractors, the key is to stay ahead of the shift. Understanding how refrigerant choice affects not just compliance but also performance and lifecycle cost is now essential.
Those who adapt early will avoid disruption and deliver systems that remain viable for years to come.
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