F-Gas regulations have been reshaping commercial cooling for over a decade, and 2026 sits in the middle of an accelerating phase-down. For facilities managers running air handling units with integrated DX cooling, the question isn’t whether F-Gas affects you — it’s how much it’s going to cost over the next five years.
We’ve worked on AHUs across pharmaceutical, industrial, commercial, and aerospace applications where DX cooling forms part of the system. Here’s what the current regulations mean in practical terms and how we approach compliance.
What F-Gas Actually Covers
The UK F-Gas Regulation controls fluorinated greenhouse gases used as refrigerants in cooling systems. The headline driver is Global Warming Potential (GWP) — the metric measuring how much heat a gas traps relative to carbon dioxide.
R-410A, used widely in DX cooling for decades, has a GWP of 2,088. R-32 sits at 675. Newer alternatives like R-454B come in around 466. The regulatory direction travels one way: lower GWP refrigerants, smaller charges, fewer leaks.
The phase-down works through a quota system limiting the volume of high-GWP refrigerants placed on the UK market. As quotas tighten, prices rise, availability drops, and high-GWP systems become progressively more expensive to maintain.
How F-Gas Affects AHUs
Pure air handling units without integrated cooling sit outside F-Gas requirements. Heat the air, cool with chilled water from a remote chiller, and the AHU itself doesn’t contain refrigerant. The chiller is the F-Gas concern, not the AHU.
DX cooling changes this. AHUs with integrated direct expansion cooling contain refrigerant directly within the unit. Our aerospace project in Derby used DX cooling integrated with gas burner heating — that unit needs F-Gas compliance throughout its operational life.
For DX AHUs, the obligations include:
Leak checks — Required at frequencies determined by refrigerant charge. Systems containing 5 tonnes CO2 equivalent or more need annual checks. 50+ tonnes CO2 equivalent need six-monthly checks. 500+ tonnes CO2 equivalent need quarterly checks. Charge in kg translates differently depending on refrigerant — an R-410A system needs annual checks at smaller actual kg charges than an R-32 system because of higher GWP.
Record keeping — Refrigerant type and quantity, leak check dates and results, any refrigerant added or recovered, technician qualifications. Records must be available for inspection and retained for at least five years.
Engineer qualifications — Anyone working on F-Gas systems needs appropriate certification. We use qualified engineers for all F-Gas work and verify subcontractor credentials.
Leak detection systems — Required on systems above 500 tonnes CO2 equivalent. These continuously monitor for refrigerant leakage rather than relying on periodic checks.
The 2026 Phase-Down Position
The current quota schedule is reducing high-GWP refrigerant availability progressively. Most new DX cooling equipment now uses lower-GWP refrigerants — typically R-32 or R-454B — but existing equipment installed with R-410A or older refrigerants remains common across the UK building stock.
For facilities operating older DX AHUs, the practical issues are:
Refrigerant cost increases — R-410A prices have climbed significantly as quotas tightened. Top-ups and recharges cost more each year.
Service availability — Engineers competent on older refrigerants remain available but the supply chain favours newer systems.
Reclaimed refrigerant — Some refrigerant remains available through recovery and reclamation, but supply is finite.
End of life decisions — Many older DX systems hit a tipping point where replacement becomes more economic than continued maintenance, driven primarily by refrigerant costs and compliance obligations rather than equipment failure.
Planning for Compliance
For any DX AHU older than around eight years, we’d recommend a structured compliance review:
Audit the asset — Refrigerant type, charge size, age, condition, leak history. Build a complete picture before decisions get made under pressure.
Calculate ongoing costs — Annual leak checks, expected top-up volumes, refrigerant cost projections. Compare against replacement with lower-GWP alternatives.
Plan replacement on your timeline — Reactive replacement after a major leak is expensive and disruptive. Planned replacement during scheduled shutdowns gives better outcomes and pricing.
Consider alternative cooling — In some applications, switching from integrated DX to chilled water cooling fed from a central plant changes the F-Gas profile entirely. The AHU stops being an F-Gas asset.
How We Approach Replacement
When existing DX AHUs reach end of life, we work with clients to specify replacements that meet current performance requirements with appropriate refrigerant choices. Our in-house manufacturing through EA Air Handlers gives us flexibility to integrate cooling technology suited to the application — DX with low-GWP refrigerant, chilled water coils, or heat pump configurations.
We delivered exactly this approach on bespoke projects including our Heathrow installation, where the unit was designed around the precise operational requirements of the site rather than fitting whatever was on the shelf.
For AHU refurbishment projects, we can often retain the existing AHU structure while replacing cooling components — keeping the casing, fan assemblies, and heating coils while installing new DX equipment with current-generation refrigerant.
Record Keeping Made Simple
The administrative burden of F-Gas compliance catches some facilities out. We provide refrigerant logbooks, automated reminders for leak check schedules, and documentation packs covering technician qualifications and equipment certificates. Treat the records as carefully as the physical maintenance — inspectors check both, and gaps in documentation get treated as compliance failures regardless of whether the equipment is operating properly.
Getting Compliance Right
F-Gas is one of those regulatory areas where doing nothing slowly becomes very expensive. If you’re not sure where you stand, get in touch and we’ll walk through your existing AHU equipment, identify the compliance position, and plan ahead before refrigerant costs or quota restrictions force reactive decisions.
