F-Gas Certification UK — How to Get Qualified as a Refrigeration and Air Conditioning Engineer (2026)

What is F-Gas certification and why is it legally required?

F-gases (fluorinated greenhouse gases) — primarily HFCs such as R-410A, R-32, R-134a and R-404A, and newer HFOs such as R-1234yf — are the refrigerants used in the vast majority of air conditioning, refrigeration and heat pump equipment. They are potent greenhouse gases: R-410A has a Global Warming Potential (GWP) of 2,088 times that of CO2, and R-404A reaches 3,922. Their mishandling — venting to atmosphere, poor recovery, leaking systems — has a significant environmental impact.

The legal basis is the UK F-Gas Regulations 2015 (The Fluorinated Greenhouse Gases Regulations 2015, SI 2015/310), which retained and transposed EU Regulation 517/2014 into UK law post-Brexit. The regulations are administered by the Environment Agency in England, with SEPA in Scotland, Natural Resources Wales and the Northern Ireland Environment Agency covering the devolved nations. The core rule is straightforward: you cannot legally carry out installation, servicing, maintenance, repair, leak checking or decommissioning of F-gas equipment unless you or your company hold the appropriate certificate.

Post-Brexit, the UK F-Gas framework diverged slightly from the EU's revised F-Gas Regulation (EU 2024/573, which came into force in March 2024 and introduces a tighter EU phase-down schedule). The UK retained its own phasedown trajectory. In practice, the certification requirements — who needs what qualification and how it is assessed — remain very closely aligned, so EU qualifications do not automatically transfer to the UK and vice versa.

Who needs F-Gas certification?

The requirement covers anyone who carries out the following activities professionally on stationary equipment containing F-gases:

• Installing refrigeration, air conditioning or heat pump systems
• Servicing, maintaining or repairing equipment containing F-gases
• Leak checking equipment above applicable charge thresholds
• Recovering F-gases from equipment (during service or decommissioning)
• Decommissioning equipment

In practical terms, that covers: refrigeration engineers, HVAC installers, air conditioning engineers, heat pump installers, commercial refrigeration technicians, and any multi-trade operatives who work on the refrigerant-side of such equipment. Electricians who only wire up the controls and never handle refrigerant do not need F-Gas certification for that specific task — but the moment they crack a refrigerant joint or connect a pre-charged line set that releases gas, they do.

Both individuals and companies need certificates. If you operate through a limited company, the company must hold a Company Certificate. Each engineer doing the physical work must hold an Individual Technician Certificate. Sole traders need both — you are simultaneously the company and the technician.

Company Certificate vs Individual Technician Certificate

The two-tier structure is a frequent source of confusion:

A company cannot send an uncertified engineer to do F-Gas work, even if the company holds a Certificate. And an individually certified engineer cannot legally undertake F-Gas work for their own company unless the company is also registered. Both must be in place.

Company Certificates are typically renewed annually through the register (REFCOM or ACRIB) for a fee. Individual Technician Certificates do not expire once awarded — but see the CPD section below for practical reasons to keep your knowledge current.

City & Guilds 2079 — the main qualification route

The primary qualification for F-Gas certification in the UK is the City & Guilds Level 2 Award in F-Gas and ODS Regulations (2079). This is the qualification recognised by REFCOM and ACRIB for the purposes of obtaining a Company Certificate and registering on the refrigerant purchase registers.

The 2079 qualification is modular. You only take the units relevant to the type of equipment you work on — you do not have to do all four to get certified for your specific scope of work.

Typical combinations: An air conditioning engineer doing domestic and commercial split systems takes Units 1 and 3. A commercial refrigeration engineer takes Units 1 and 2. A heat pump installer (ASHP only) takes Units 1 and 4. An engineer covering all three trade areas takes all four units — this is the most commercially versatile route and is increasingly common as heat pump demand grows.

Each unit has a theory component (multiple choice examination) and a practical assessment carried out at an approved training centre with actual refrigerant handling equipment. You must pass both to achieve the unit. Pass rates vary by unit: Unit 1 theory is widely reported to pass around 85% of first-time candidates; the practical units (2, 3, 4) see more resits, particularly on refrigerant recovery procedures and leak detection technique.

REFCOM vs ACRIB — registers and why they matter

Passing your City & Guilds 2079 units gives you an individual qualification. To legally operate as a business handling F-gases — and crucially, to be able to purchase virgin refrigerants from wholesalers — your company must be on one of the two approved registers:

• REFCOM (Register of Companies Competent to Manage Refrigerants) — the largest UK register, administered by the HVAC&R sector body. Widely recognised by refrigerant wholesalers, Screwfix Trade, Beijer Ref, Climate Center and others as proof of company certification. Annual membership fees typically range from around £180 to £350 depending on company size and scope of certification.
• ACRIB (Air Conditioning and Refrigeration Industry Board) — the other approved register body, also widely recognised. ACRIB also runs its own approved assessment centres for the practical components. Annual fees are broadly comparable to REFCOM.

Both registers are approved by the Environment Agency and both give the company certificate that allows refrigerant purchase. In practice, most refrigerant wholesalers will check your REFCOM or ACRIB registration number before selling you refrigerants — if you are not on the register, you cannot buy F-gases in bulk. This makes registration non-negotiable for any engineer who sources their own refrigerants rather than relying on a certified employer.

Refrigerant cylinders are now also sold with traceability codes and your certificate number is logged against purchases, which means the Environment Agency can audit refrigerant usage against company certificates during inspections.

Assessment: theory, practical and resit costs

Each 2079 unit involves two stages of assessment:

• Theory examination: multiple choice paper, typically 30–40 questions per unit, taken under invigilated conditions at the training centre. Pass mark is usually 70%.
• Practical assessment: hands-on tasks assessed by a qualified assessor. Tasks include connecting manifold gauges, using a vacuum pump, operating a recovery machine, performing a leak check with an electronic detector, and (for units 2/3/4) demonstrating correct refrigerant charge technique.

The most common resit trigger is the practical — specifically the recovery procedure, where candidates fail to demonstrate correct cylinder handling or weigh-in/weigh-out technique. Spending an extra hour before your assessment date practising on the training centre's rigs (many offer this) significantly reduces resit risk.

Where to train and how to choose a centre

City & Guilds 2079 training and assessment must be carried out at a City & Guilds Approved Centre. You can search the full list on the City & Guilds website. ACRIB also maintains a list of its approved assessment centres.

Key things to check when choosing a training centre:

• Centre approval: confirm they are a current City & Guilds Approved Centre for 2079 (not just a training provider who sends you elsewhere for assessment).
• Equipment quality: the practical assessment requires real refrigeration rigs — not simulations. Ask to see the training rigs before booking.
• Pass rate transparency: reputable centres will tell you their first-attempt pass rates. Be wary of centres that cannot or will not share this.
• REFCOM/ACRIB affiliation: some centres handle your REFCOM registration paperwork as part of the package, which saves admin time.
• Location and scheduling: many working engineers need weekend or early weekday slots. Centres in major cities (London, Birmingham, Manchester, Leeds, Glasgow) typically offer more frequent course dates.

Typical full-scope training (Units 1–4) takes 4–5 days, often split across two weeks. An AC-only route (Units 1 and 3) takes 2–3 days. Many centres run theory on day one and practical assessment on day two or three, meaning you can be assessment-ready very quickly if you prepare beforehand.

Heat pumps, the Boiler Upgrade Scheme and why F-Gas matters more in 2026

The UK government's Boiler Upgrade Scheme (BUS) — which provides grants of £7,500 for air source heat pumps and £7,500 for ground source heat pumps — has driven a significant increase in heat pump installation demand. Heat pumps use HFC or HFO refrigerants in their refrigeration circuits and are therefore squarely within F-Gas regulation scope.

To install heat pumps under MCS (Microgeneration Certification Scheme) — which is required for customers to claim the BUS grant — you need:

• MCS company certification (Heat Pump category)
• F-Gas certification (City & Guilds 2079 Unit 1 + Unit 4)
• REFCOM or ACRIB Company Certificate

Many heating engineers entering the heat pump market from a gas background have Gas Safe registration but no F-Gas certification. This is the single most common compliance gap among BUS-funded installers. If you are a heating engineer looking to transition into heat pumps, getting your 2079 Units 1 and 4 is the immediate priority — without it, you cannot legally handle the refrigerant side of any heat pump installation.

The heat pump market is also where F-Gas enforcement attention is increasingly focused. RECC (Renewable Energy Consumer Code) complaints about poorly installed heat pumps often involve F-Gas compliance issues — undercharged systems, incorrect refrigerant type, no leak test documented. The Environment Agency has been clear that BUS-funded work does not get a compliance pass just because it is grant-funded.

Annual CPD and keeping your qualification current

Individual Technician Certificates (the City & Guilds 2079 qualification) do not have a formal expiry date — once you pass, the certificate is yours. However, there are practical reasons to treat ongoing CPD as important:

• Refrigerant changes: the transition from R-410A to R-32 for air conditioning, and to lower-GWP alternatives, means the refrigerants you encounter on new equipment in 2026 may be different from those covered in your original training. Understanding the properties, safe handling and charging differences for R-32 (mildly flammable — A2L classified) is essential.
• Regulation changes: UK F-Gas Regulations have been updated and will continue to evolve. REFCOM and ACRIB both publish regulatory updates for members — being on a register is a practical way to stay current.
• REFCOM/ACRIB membership CPD requirement: both registers require evidence of ongoing competence as part of annual renewal. This is typically satisfied by attending manufacturer technical days, HVACR industry events or completing short online modules from ACRIB or RACHP (the Refrigeration, Air Conditioning and Heat Pump industry body).
• A2L refrigerant handling: R-32 and R-1234yf are classified A2L (mildly flammable). Handling A2L refrigerants requires specific awareness of ignition risk management — many engineers seek additional short-form training on this even if their core 2079 certificate covers the theoretical basis.

How to price F-Gas work: building certification costs into your rates

F-Gas certification is a cost of doing business in refrigeration and HVAC, and it should be priced accordingly — not absorbed as a margin hit. Here is how to think about it:

1. Amortise the qualification cost

A full 2079 qualification at £800 plus first-year REFCOM at £250 = £1,050 in year one. If you do 100 F-Gas jobs per year, that is £10.50 per job in certification overhead. At 200 jobs, it is £5.25. This cost is real but small relative to job values — AC installation jobs typically run £800–£3,500; commercial refrigeration service calls £150–£400. The certification overhead is a fraction of a percent of revenue.

2. Quote refrigerant handling as a line item

Never bundle refrigerant cost into your day rate. Quote it explicitly: refrigerant (type, kg, price per kg), recovery charge where applicable, and any leak check fee as separate line items. This protects you when refrigerant prices spike — R-410A costs have risen significantly as phase-down supply restrictions bite — and it makes your compliance visible to the customer, which has commercial value.

A refrigerant handling line item also makes it obvious why you — the certified engineer — cost more than an uncertified operative advertising on local Facebook groups. It signals professionalism and compliance.

3. Service contract pricing

If you offer annual service contracts for AC or refrigeration equipment, include the annual leak check (where applicable) and refrigerant top-up allowance in your contract pricing. Itemise these in the contract scope so customers understand what is covered. A contract that clearly states "annual F-Gas leak check (as required by UK F-Gas Regulations 2015) included" is a stronger selling point than a vague "annual service."

4. REFCOM annual fee as overhead

Your REFCOM or ACRIB annual membership is a fixed overhead. At £180–£350 per year, it belongs in your overhead recovery calculation alongside van costs, insurance and tool depreciation — not charged per job. Build it into your day rate or overhead recovery target.

Step-by-step: how to get F-Gas certified in 2026

1. Identify your scope — decide which units you need (Unit 1 is mandatory; add 2, 3, and/or 4 based on the equipment you work on).
2. Find a City & Guilds Approved Centre — search on the City & Guilds website (search "2079 approved centres") or via ACRIB's centre locator. Book early: popular centres fill up several weeks in advance.
3. Prepare for theory — City & Guilds publish a specification for the 2079 units. HVAC&R training providers sell revision workbooks (typically £15–£30). The REFCOM website also has free guidance notes on the regulations.
4. Complete training and assessment — attend your booked course, pass theory and practical. Collect your City & Guilds certificate (usually issued within 2–4 weeks of assessment).
5. Register with REFCOM or ACRIB — submit your individual certificate as evidence and apply for your Company Certificate. Pay the annual fee. You will receive a company certificate number.
6. Open refrigerant accounts with wholesalers — Beijer Ref, Climate Center, Lindberg and others will ask for your REFCOM/ACRIB number when you open a trade account. Provide it and you can purchase refrigerants legally.
7. Set up your F-Gas record keeping — you are legally required to record the refrigerant type, quantity added/removed and leak check results for every F-Gas job. Do this job-by-job from day one.