F-Gas Regulations UK: Complete Guide for HVAC Engineers 2026

F-Gas stands for fluorinated greenhouse gases — the refrigerants used in the vast majority of air conditioning, heat pump, refrigeration, and chiller equipment. These gases have a Global Warming Potential (GWP) hundreds or thousands of times higher than carbon dioxide, making them regulated pollutants.

The EU introduced comprehensive F-Gas regulations under EU Regulation 517/2014, which came into force in 2015. When the UK left the EU, these regulations were retained in UK law through the European Union (Withdrawal) Act 2018, becoming the UK F-Gas Regulations. The UK regulations now operate independently of the EU, though the two frameworks remain broadly similar.

The core objectives of the UK F-Gas Regulations are:

• Reduce the use of high-GWP refrigerants by phasing them down progressively
• Prevent unnecessary release of refrigerants during handling, servicing, and decommissioning
• Ensure that only certified and competent engineers handle refrigerants
• Maintain records of refrigerant use across the installed base

For HVAC engineers, the regulations create specific legal obligations around certification, refrigerant record-keeping, and the types of equipment that can be installed.

The critical point for any HVAC engineer or HVAC business is this: it is illegal to handle fluorinated refrigerants without the appropriate F-Gas certification. This is not a technicality or an obscure compliance point — it is a criminal offence that can result in significant penalties.

"Handling" refrigerants means any activity that involves the refrigerant circuit, including:

• Installing new systems involving a refrigerant circuit
• Servicing or maintaining systems that contain refrigerant
• Recovering refrigerant from a system before decommissioning
• Charging or topping up refrigerant
• Leak testing the refrigerant circuit
• Any repair involving opening the refrigerant circuit

In addition to individual engineer certification, businesses that carry out these activities on systems containing 3kg or more of refrigerant (or on hermetically sealed systems containing 6kg or more) must hold a company F-Gas certificate from an approved certification body. Operating a business without this company certificate is a separate offence from operating as an uncertified individual.

REFCOM (Refrigeration and Air Conditioning Certification) is the UK's leading F-Gas certification body, approved by the Environment Agency. It issues both individual engineer qualifications and company F-Gas certificates.

Individual Engineer Qualifications

Individual engineers must hold a valid F-Gas qualification. REFCOM certification categories are based on the type of equipment and refrigerant circuit:

• Category I: covers all stationary refrigeration, air conditioning, and heat pump equipment (both hermetically sealed and non-hermetically sealed). This is the most comprehensive category and is what most commercial HVAC engineers need. Assessment includes practical and theoretical components.
• Category II: covers non-hermetically sealed systems with a refrigerant charge below a certain threshold. More limited in scope than Category I.
• Category III: covers hermetically sealed systems only. Very limited in what it permits.
• Category IV: covers recovering refrigerant only — not servicing or installation.

Most HVAC engineers working on commercial equipment should hold Category I. Engineers who only do domestic split system work may hold a lower category, but Category I provides the most flexibility.

Company F-Gas Certificate

The business (not just individual engineers) must be registered with an approved certification body if it works on systems with 3kg or more refrigerant charge. REFCOM company registration requires proof that sufficient certified engineers are employed, appropriate refrigerant handling equipment is available, and procedures for refrigerant record-keeping are in place. Company certificates must be renewed annually.

How to Get REFCOM Certified

Individual certification involves training (either self-study or via an approved training provider) and a formal assessment combining practical and theoretical elements. Many colleges offering refrigeration and air conditioning courses are REFCOM-approved assessment centres. Costs vary: approximately £200–£500 for Category I assessment depending on the provider.

F-Gas regulations require operators (the companies or individuals responsible for equipment) to maintain refrigerant logbooks for qualifying systems. HVAC engineers are obligated to make accurate entries in these logbooks during service visits and to ensure they are maintained for systems they are responsible for.

Which Systems Require a Logbook?

Logbooks are required for any stationary refrigeration, air conditioning, or heat pump system with a refrigerant charge equivalent to 5 tonnes CO₂ or more. This is calculated by multiplying the refrigerant mass in kg by the refrigerant's Global Warming Potential (GWP) value and dividing by 1,000.

For example:

• A system containing 3kg of R-410A (GWP: 2,088) contains 6.3 tonnes CO₂e — requires a logbook
• A system containing 1kg of R-32 (GWP: 675) contains 0.675 tonnes CO₂e — does not require a logbook
• A system containing 5kg of R-407C (GWP: 1,774) contains 8.9 tonnes CO₂e — requires a logbook

What Must Be Recorded?

Each logbook entry must record:

• Quantity and type of refrigerant installed
• Quantities added during servicing or to compensate for leaks
• Quantities recovered at servicing or decommissioning
• Results of any leakage checks performed
• Any periods of downtime due to leaks
• Identity of the servicing company and the certified engineer who performed the work
• Dates of all activities

Logbooks must be retained for at least 5 years after the equipment has been decommissioned. Digital logbooks are legally acceptable — there is no requirement to use paper.

One of the most commercially significant elements of UK F-Gas Regulations is the progressive phase-down of high-GWP refrigerants — primarily the hydrofluorocarbons (HFCs) that dominate most existing HVAC installations.

The Phase-Down in Practice

The UK F-Gas Regulations impose a quota system on the amount of HFC refrigerants that can be placed on the UK market, reducing the quota progressively over time. The quota is measured in CO₂ equivalent tonnes, not kilograms of refrigerant — which means high-GWP refrigerants like R-410A (GWP 2,088) are disproportionately affected compared to lower-GWP alternatives.

The key effect for HVAC engineers:

• HFC refrigerants (R-410A, R-404A, R-407C, R-134a) are becoming progressively more expensive as the quota tightens supply. R-410A prices increased significantly over 2019–2024 and will continue to rise.
• New lower-GWP alternatives (R-32, R-454B, R-466A, R-290 propane) are increasingly being specified in new equipment. Engineers need to be familiar with the handling requirements of these alternatives, including appropriate safety protocols for mildly flammable refrigerants (A2L classification, which includes R-32 and R-454B).
• New equipment containing R-410A can no longer be placed on the UK market from a specific date under the phase-down schedule. Engineers should be aware that R-410A systems installed now will face increasing refrigerant costs for the life of the equipment.

Implications for HVAC Businesses

HVAC businesses should advise commercial clients on the refrigerant implications when specifying new equipment — particularly for commercial installations with significant refrigerant charges. Choosing lower-GWP refrigerant systems now reduces future servicing costs and insulates clients from refrigerant price increases driven by the phase-down.

The Environment Agency enforces the UK F-Gas Regulations and can impose significant penalties for non-compliance. This is not a box-ticking compliance area — enforcement does occur:

• Handling refrigerants without certification: criminal offence. Individuals can face prosecution and fines. Businesses can face prosecution, fines, and reputational damage.
• Operating a business without company F-Gas certification: separate criminal offence for the business entity. Fines of up to £200 per breach for individuals and up to £1,000 per breach for companies, with each violation being a separate breach.
• Failure to maintain required logbooks: civil penalty of up to £200 per breach for equipment operators, up to £1,000 for businesses providing services.
• Placing non-compliant equipment on the market: significant financial penalties. This is more relevant to importers and manufacturers but affects engineers who may install non-compliant equipment.

Beyond formal penalties, working without F-Gas certification will invalidate your public liability insurance for any claim arising from that work. If a refrigerant leak causes damage to a commercial property and it emerges you were not certified, your insurer can refuse to cover the claim — leaving you personally liable.

F-Gas regulations also mandate regular leakage checks for systems above certain charge thresholds. These checks must be performed by a certified engineer:

• Systems containing 5 tonnes CO₂e or more: annual leakage check required
• Systems containing 50 tonnes CO₂e or more: leakage check every 6 months required
• Systems containing 500 tonnes CO₂e or more: leakage check every 3 months required
• Systems with approved automatic leak detection systems: frequency can be halved

These leakage check requirements create a built-in compliance driver for annual service contracts. Any commercial client operating qualifying HVAC equipment is legally obligated to arrange regular leakage checks — which means there is always a legitimate reason to approach commercial clients about a maintenance contract.

The results of leakage checks must be recorded in the system logbook. HVAC engineers should ensure that their service reports capture all required logbook information so that clients can demonstrate compliance to the Environment Agency if required.