Summary

The fluorinated greenhouse gas (F-Gas) regulations exist to cut emissions of HFCs, PFCs, and SF₆ — synthetic gases with global warming potentials hundreds or thousands of times higher than CO₂. In the UK, the legal framework is the Fluorinated Greenhouse Gases Regulations 2015 (SI 2015/310), significantly updated by SI 2022/1013, which came into force on 1 January 2022 following the end of the EU transition period. The UK now operates its own HFC phase-down quota system, separate from the EU F-Gas regime, administered by the Environment Agency.

For air conditioning and refrigeration engineers, the regulations touch almost every aspect of daily work: who can legally handle refrigerant, how often equipment must be inspected for leaks, how refrigerant must be labelled and logged, and what happens when systems are decommissioned. Non-compliance carries civil penalties of up to £200,000 per offence in England, Wales, and Scotland (enforced by the Environment Agency and equivalent bodies), so getting the details right is not optional.

A common misconception is that the leak check frequency is tied solely to the physical refrigerant charge weight. In practice, the trigger threshold is CO₂-equivalent charge size, calculated by multiplying the charge weight in tonnes by the refrigerant's Global Warming Potential (GWP). A system charged with just 2.4 kg of R410A (GWP 2088) already exceeds the 5-tonne CO₂e threshold and requires annual checks. Understanding the CO₂e calculation is therefore essential for every engineer working with high-GWP refrigerants.

Another area of frequent confusion is the distinction between individual technician certification and company (operator) obligations. A certified technician can legally handle refrigerant; but the operator of the equipment — the building owner or facilities manager — is responsible for ensuring leak checks happen, records are kept, and that only certified technicians are used. As the installing or servicing contractor, you are frequently in practice the person who carries out these obligations on the operator's behalf, which means your records and logbooks need to be watertight.

Key Facts

  • CO₂-equivalent charge threshold — multiply refrigerant charge weight (kg) by refrigerant GWP and divide by 1,000 to get tonnes CO₂e
  • Annual leak check threshold — ≥5 tonne CO₂e (e.g., 2.4 kg R410A, 7.4 kg R32, or 1,667 kg CO₂/R744)
  • Six-monthly leak check threshold — ≥50 tonne CO₂e
  • Quarterly leak check threshold — ≥500 tonne CO₂e
  • Automatic leak detection systems (ALDS) — halve the required check frequency when a fixed ALDS is fitted (so a 50-tonne CO₂e system with ALDS only needs annual checks instead of six-monthly)
  • Technician certification — Category I covers all equipment; Category II covers systems with <3 kg charge (or <6 kg hermetically sealed); City & Guilds 2079 Parts 1 and 2 are the standard routes
  • F-Gas logbook — must record date, type and quantity of refrigerant added or removed, name and certification number of technician, results of leak checks, and action taken on identified leaks
  • Record retention — minimum five years for equipment logbooks and refrigerant purchase/recovery records
  • Equipment labelling — all F-Gas equipment must carry a label showing refrigerant type and charge in kg; GWP and CO₂e must be included on new equipment labels from 1 January 2017
  • Refrigerant containers — bulk containers must be labelled with refrigerant type, GWP, and CO₂e; reclaimed/recycled refrigerant must meet purity standards before reuse
  • Recovery obligation — refrigerant must be recovered before decommissioning or opening systems for service; it may not be vented to atmosphere under any circumstances
  • HFC phase-down — UK quota system reduces bulk HFC supply annually; quota allocations are managed by the Environment Agency, affecting refrigerant availability and cost
  • Hermetically sealed systems — systems where all refrigerant-containing parts are sealed by welding, brazing, or equivalent and certified charge is <10 g are exempt from leak checking obligations
  • Operators vs contractors — the equipment operator bears the legal duty to ensure checks are carried out; contractors carry out the work on their behalf and must provide records to support the operator's compliance

Quick Reference Table

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CO₂e Charge Size Minimum Leak Check Frequency With Automatic Leak Detection
< 5 tonne CO₂e No periodic leak check required No periodic leak check required
≥ 5 tonne CO₂e Annually Annually
≥ 50 tonne CO₂e Every 6 months Annually
≥ 500 tonne CO₂e Every 3 months Every 6 months
Refrigerant GWP Charge for 5 t CO₂e Charge for 50 t CO₂e
R32 675 7.4 kg 74 kg
R410A 2088 2.4 kg 24 kg
R134a 1430 3.5 kg 35 kg
R407C 1774 2.8 kg 28 kg
R290 (propane) 3 1,667 kg Not applicable in practice
R744 (CO₂) 1 5,000 kg Not applicable in practice
R1234yf 4 1,250 kg Not applicable in practice

Detailed Guidance

Calculating CO₂-Equivalent Charge

The formula is straightforward: multiply the charge weight in kilograms by the refrigerant's GWP, then divide by 1,000 to convert to tonnes of CO₂ equivalent.

Example: A rooftop multi-split system holds 12 kg of R410A. 12 kg × 2088 (GWP) ÷ 1,000 = 25.06 tonnes CO₂e

This system sits above the 5-tonne threshold but below 50 tonnes, so it requires an annual leak check. If the same system held R32 instead: 12 kg × 675 ÷ 1,000 = 8.1 tonnes CO₂e — still above 5 tonnes, still annual checks, but a much lower environmental impact from any leakage.

When calculating CO₂e for a system that has had refrigerant added or topped up, always use the actual total charge in the system, not the nameplate charge. If the system has had additional refrigerant added beyond the manufacturer's stated charge, the actual charge is what counts. A prudent practice is to confirm the total charge during each service visit and update the equipment logbook accordingly.

Technician Certification Requirements

Individual technicians must hold a valid F-Gas qualification to legally carry out any work that involves intentional or foreseeable release of F-Gases, or to purchase F-Gas refrigerants. In practice, this means any maintenance, service, repair, installation, or decommissioning work on refrigeration and air conditioning systems containing HFCs.

The two main categories in the UK are:

  • Category I — covers all refrigeration and air conditioning systems regardless of charge size; required for work on commercial refrigeration, large air conditioning, and any system where you may need to open the refrigerant circuit
  • Category II — covers systems containing less than 3 kg of refrigerant (or less than 6 kg in hermetically sealed systems); suitable for smaller domestic and light commercial splits

City & Guilds 2079 is the most widely recognised qualification pathway in England, Scotland, and Wales. The relevant units are:

  • Unit 2079-11 — Core F-Gas principles (required for all categories)
  • Unit 2079-21 — Category I certification
  • Unit 2079-22 — Category II certification

BESA (Building Engineering Services Association) and CITB also run approved training programmes. Qualifications must be obtained through an approved assessment body — a list is maintained by REFCOM and the Environment Agency.

Certificates do not expire under current UK regulations, but technicians must maintain competence and keep up with regulatory changes. Some companies require periodic refresher training as an internal policy requirement.

F-Gas Logbook Requirements

Every system above the 5-tonne CO₂e threshold must have a written equipment logbook maintained by the operator. As a contractor, you will typically complete entries in the logbook at each visit. The minimum required entries are:

  • Equipment details — type, location, refrigerant type, charge weight, CO₂e, serial number
  • Leak check results — date of check, method used (electronic detection, UV dye, soapy water, pressure test), result (pass/leak found), location of any leak, action taken
  • Refrigerant movements — date, quantity added (in kg), quantity recovered (in kg), source of refrigerant added (new, reclaimed, recycled), and the technician's name and certification number
  • Maintenance records — any work carried out that involved accessing the refrigerant circuit
  • Automatic leak detection — if fitted, test results and any activations

Logbooks can be paper or electronic. If electronic, the operator must be able to produce a printed copy on request. REFCOM provides free logbook templates downloadable from their website. A separate logbook entry must be made each time refrigerant is added or removed — it is not acceptable to record only the net change at year-end.

Keep your own copy of every entry you make. If a dispute arises about whether a leak was reported or a top-up was within legal limits, your copy of the logbook entry is your evidence.

Equipment Labelling

All equipment containing F-Gases must be labelled. For air conditioning and heat pump systems, labels must show:

  • Refrigerant type (e.g., R32, R410A)
  • Quantity of refrigerant contained, in kg
  • GWP of the refrigerant
  • CO₂-equivalent quantity (in tonnes CO₂e)
  • Statement: "Contains fluorinated greenhouse gases"

Labels must be in English (in England, Scotland, and Wales) and permanently attached to the equipment. For split systems, labels should appear on both the indoor and outdoor units. If a label is missing or unreadable, you are required to replace it — this is part of your service obligation under the regulations.

Bulk containers (drums and cylinders) of refrigerant must also be labelled with the same information, along with the container's tare weight and gross weight. Unlabelled containers may not legally be transported or used.

HFC Phase-Down and Refrigerant Availability

The UK operates a quota-based system for limiting the supply of bulk HFCs. Quota allocations are reduced year-on-year, following a schedule similar to (but now separate from) the EU's phase-down. The overall target is an 80% reduction in HFC CO₂-equivalent supply by 2036 compared to the 2015 baseline.

In practice, this means that high-GWP refrigerants — particularly R410A (GWP 2088) and R404A (GWP 3922) — are becoming increasingly scarce and expensive. R410A is no longer permitted in new equipment placed on the market in the UK for most applications from 2025, and supply for servicing existing systems will tighten progressively.

For engineers, this has two practical implications. First, customers with older R410A systems will face increasing servicing costs as refrigerant prices rise; advise them now about eventual system replacement with lower-GWP alternatives. Second, when specifying new installations, always choose equipment using low-GWP refrigerants (R32, R290, or R1234yf) to ensure long-term serviceability for your customers.

Recovery Obligations

Refrigerant must never be vented to atmosphere. Before opening any part of a refrigerant circuit — whether for a minor repair, component replacement, or full decommissioning — all refrigerant must be recovered into an approved recovery cylinder using certified recovery equipment.

Recovered refrigerant may be:

  • Returned to the manufacturer or a reclaim facility for reconditioning
  • Reused in the same system from which it was recovered (if within GWP and purity limits)
  • Transferred to another system owned by the same operator, subject to quality checks

Recovery records must be maintained showing the quantity recovered, the date, the technician's name and certification number, and the disposal or reuse route. Keep recovery records for five years.

Frequently Asked Questions

Do I need F-Gas certification to work on heat pumps?

Yes, if the heat pump contains HFC refrigerants (such as R32 or R410A). The F-Gas regulations apply to any system containing fluorinated greenhouse gases, regardless of whether it is for heating, cooling, or both. Air source and ground source heat pumps using HFC refrigerants are fully within scope. Systems using R290 (propane) are not covered by F-Gas regulations but are subject to different safety requirements under DSEAR and HSE guidance for flammable substances.

Can I top up a system without recording it?

No. Every addition of refrigerant to a system must be recorded in the equipment logbook, with the date, quantity, refrigerant type, and your certification number. There is no minimum threshold below which a top-up can go unrecorded. If you add even 100g of refrigerant, it must be in the logbook.

Who is responsible for making sure leak checks happen — me or the building owner?

The operator (building owner or tenant with contractual responsibility) is legally responsible for ensuring checks are carried out at the required frequency. However, as the contractor, you need to be proactive: if a system you service is overdue for a check, bring it to the operator's attention in writing and schedule it. If a customer refuses to allow mandatory checks, document your advice in writing and, if necessary, decline to continue servicing the equipment.

What happens if I find a leak during a routine check?

You must record the leak in the equipment logbook, including its location and the quantity of refrigerant estimated to have been lost. The operator must arrange repair within 30 days of the leak being identified. After repair, a leak check must be carried out within 30 days to confirm the repair is effective. If the repair is not completed within the timeframe, you should advise the operator of their compliance obligation in writing.

Can I use reclaimed refrigerant in a customer's system?

Yes, but only if the reclaimed refrigerant meets the purity standards specified in the regulations and is accompanied by documentation confirming its origin and quality. Reclaimed refrigerant that has been professionally processed and certified can legally be used in any compatible system. Refrigerant simply transferred from another job site without formal reclaim documentation cannot legally be used.

Regulations & Standards

  • Fluorinated Greenhouse Gases Regulations 2015 (SI 2015/310) — primary UK legislation establishing the F-Gas framework, certification requirements, and operator obligations

  • Fluorinated Greenhouse Gases (Amendment) Regulations 2022 (SI 2022/1013) — post-Brexit amendments establishing the UK's independent HFC quota system and updating enforcement provisions

  • Commission Regulation (EU) No 2015/2067 — referenced for technician competency standards (adopted into UK law via the transition period); sets minimum competency requirements for F-Gas qualifications [verify current UK-specific equivalent]

  • BS EN 378 — Refrigerating systems and heat pumps — safety and environmental requirements; Parts 1-4 cover design, construction, installation, service, maintenance, and decommissioning

  • ACOP L8 — whilst primarily for legionella, referenced in facilities management contexts alongside F-Gas compliance

  • Environment Agency Guidance: Fluorinated greenhouse gases (F gases) — official UK guidance on obligations, quotas, and enforcement

  • HSE INDG381 — guidance on safe handling of refrigerants (flammability and pressure safety, complementing F-Gas compliance)

  • UK F-Gas Regulations guidance — GOV.UK — primary Environment Agency guidance for operators and contractors

  • REFCOM — F-Gas Regulations Overview — industry body summary with logbook templates and technician search

  • City & Guilds 2079 F-Gas qualification — qualification structure, units, and approved assessment centres

  • HFC Phase-down quota system — Environment Agency — UK quota allocations and reduction schedule

  • BS EN 378 — BSI Standards — refrigeration system safety standard (purchase required)

  • refcom certification — REFCOM company registration, what it covers, and how to check a contractor's status

  • refrigerant types comparison — R32 vs R410A vs R290: GWP, flammability, and installer implications

  • split system installation — practical installation guide covering pipe sizing, electrical supply, and drainage

  • hvac commissioning and handover — commissioning documentation, F-Gas records, and customer handover requirements

  • ac maintenance annual service — what to cover in an annual service visit to meet F-Gas and manufacturer obligations