F-Gas Regulations UK: What Businesses With Air Conditioning Must Do in 2026

F-gases are fluorinated greenhouse gases. In air conditioning they are the refrigerants, the stuff that actually moves heat around your building. Common ones are R410A, R32 and R134a. They work extremely well, and they are also potent greenhouse gases. R410A has a global warming potential of 2,088, meaning one kilogram of it leaking into the atmosphere does roughly the same damage as 2,088kg of CO2.

The UK F-Gas regulations exist to stop that happening. They do three things: they force the industry to gradually use less high-GWP gas over time, they require anyone working on the equipment to be certified, and they place a legal duty on the people who own and operate the kit to keep it leak-free and documented.

The Environment Agency enforces the rules in England, with SEPA in Scotland and Natural Resources Wales in Wales.

You are. This is the single biggest misunderstanding we run into.

GOV.UK is explicit that responsibility for stopping F-gas leaks is shared between the users of the equipment and the service technicians who work on it. But the duty to make sure leak checks actually happen, and the duty to hold the records, sits with the operator of the equipment. That is normally the business occupying the building.

If the Environment Agency inspects you and asks for five years of leak check records and you do not have them, "our contractor handles all that" is not a defence. It is your paperwork.

There is one nuance worth knowing. If you rent equipment rather than own it, responsibility for leak checks may sit with the rental company instead, depending on what your rental agreement says. Check the contract.

Not all of them. The threshold is based on the amount of CO2 equivalent in the system, which is the refrigerant charge multiplied by that refrigerant's global warming potential.

Below 5 tonnes CO2e, there is no mandatory leak check frequency. At or above it, the clock starts.

Here is what that means for the refrigerants you are most likely to have in a commercial building:

Thresholds per the Environment Agency guidance on checking F-gas equipment for leaks. Figures rounded.

In practice, for a Kent office or retail unit:

• A single wall-mounted split serving one room typically holds 1kg to 2kg of refrigerant. Under the threshold. No mandatory leak check.
• A multi-split serving four or five rooms can sit right on the line at 2.4kg of R410A. Worth checking properly rather than assuming.
• A VRF system serving a whole floor or building will almost always be over 5 tonnes CO2e, and mid-sized VRF frequently crosses 50 tonnes CO2e, which pushes you to 6-monthly checks.
• Hermetically sealed systems have no mandatory check period unless they contain 10 tonnes CO2e or more.

There is a useful planning point buried in that table. Because R32 has roughly a third of the GWP of R410A, an R32 system can hold about three times the refrigerant before triggering the same obligation. If you are already planning a replacement, moving to R32 can take a borderline system out of mandatory leak-check territory entirely. That is a compliance saving on top of the energy saving, and it rarely gets mentioned in installation quotes.

Five years, for any system holding 5 tonnes CO2e or more. The Environment Agency can ask to see them during an inspection.

Your records must cover:

• The quantity and type of gas in the equipment when it was installed
• The quantity and type of gas added during any maintenance, including leak repairs
• The dates and results of every mandatory leak check
• What was done to recover and dispose of gas, including the registered waste carrier used
• If recycled or reclaimed gas was used, the quantity recovered and the name, address and certificate number of the reclamation facility
• The name, address and certificate number of every company used to install, service or decommission the equipment

That last one matters. You are expected to be able to prove your engineer was certified. Ask for the company certificate number and keep it on file.

You are breaking the law if you do not have the right leak checks in place or do not fix leaks that are found. The Environment Agency can issue civil penalties, and it publishes its approach in the Environment Agency enforcement and sanctions policy.

There is also a practical cost that businesses underestimate. A leaking system is an inefficient system. Refrigerant loss degrades cooling capacity long before the unit stops working, so the compressor runs longer to achieve the same temperature and your energy bill climbs quietly for months. We have covered how that plays out on the bill in our guide to air conditioning running costs. A leak you did not catch is money leaving the building twice, once through the refrigerant and once through the electricity meter.

These two get conflated constantly, and businesses regularly assume that having one covers the other. It does not.

If your building has 12kW or more of combined cooling capacity, which is a low bar covering most offices, shops, restaurants and small industrial units, you need a valid TM44 report on file as well. It must be handed over when responsibility for the building changes hands. Government has been consulting on strengthening the penalty regime for TM44 non-compliance, so this is one to get in order rather than leave.

The UK is phasing HFCs down by 79% by 2030 against a 2009 to 2012 baseline. The next step lands on 1 January 2027, when production and imports drop to 24% of the baseline.

Defra ran a consultation on reforming the phase-down schedule and confirmed in May 2026 that it will not legislate during 2026 to change the steps beginning on 1 January 2027. The existing step stands while further reform is considered.

What that means for you as a business owner is straightforward. Less high-GWP gas will be available, and what is available will get more expensive. Businesses running older R410A or R407C plant should expect servicing costs on those systems to rise over the next few years, not fall.

Two clarifications, because there is a lot of scare content on this online:

• R410A is not banned. It was phased out for new domestic installations from 2020, but existing systems remain legal to run and legal to refill.
• The refill ban is narrower than people think. It applies to virgin F-gas with a GWP above 2,500 in refrigeration systems holding 40 tonnes CO2e or more. In practice that mostly hits R404A in commercial refrigeration, supermarket pack systems and industrial plant. It does not stop you topping up a normal R410A air conditioning system.

If you are running R404A refrigeration at 40 tonnes CO2e or above, your options are reclaimed or recycled gas until 2030, retrofilling with a lower-GWP alternative such as R448A or R449A following manufacturer guidance, or replacing the system.

For most Kent businesses, compliance is not complicated once it is set up. It looks like this:

1. Survey what you have. Record every system, its refrigerant type and its charge size. Calculate the CO2e for each. This tells you which systems are in scope and at what frequency.
2. Put the in-scope systems on a scheduled contract at the correct interval, carried out by an F-Gas certified company.
3. Keep one central logbook, digital is fine, holding the records listed above for five years.
4. Check your TM44 status separately if you are at or above 12kW combined cooling capacity.
5. Fix leaks properly and recheck within a month. A recheck is a legal requirement after a repair, not an optional extra.

If a leak turns into a breakdown, that becomes a repair job rather than a maintenance one. We cover the warning signs in why your air conditioning is not cooling, and the general servicing rhythm in how often air conditioning should be serviced.

All Kent Cooling is an F-Gas certified contractor working across Kent and Medway, including Rochester, Chatham, Maidstone, Ashford and Sittingbourne. Our commercial air conditioning maintenance contracts cover scheduled leak checks at the correct legal interval for your system size, full record keeping in a format that stands up to an Environment Agency inspection, and prompt leak repair with the mandatory one-month recheck built in.

If something has already failed, our commercial air conditioning repair team can get you running again and bring the documentation back up to date at the same time. If you are specifying a new system and want the compliance burden designed out from the start, our commercial air conditioning installation team will size the refrigerant charge with the CO2e thresholds in mind rather than leaving you to discover them later. Costs for that are broken down in our commercial air conditioning cost guide.

Not sure whether your systems are in scope? Get in touch for a free compliance review. We will identify which of your units cross the 5 tonne CO2e threshold, tell you what interval you are legally on, and set up the record keeping. No obligation, and it takes about twenty minutes on site for a typical office.

Do I need F-Gas certification to own an air conditioning system? No. You do not need to be certified to own or operate a system. You do need to use an F-Gas certified company for any installation, servicing, maintenance, repair, recovery or decommissioning work, and you need to keep a record of that company's certificate number.

How often do F-Gas leak checks need to be done in the UK? At least every 12 months for systems containing 5 to under 50 tonnes CO2e, at least every 6 months for 50 to under 500 tonnes, and quarterly for 500 tonnes or more where the equipment is electrical switchgear or an organic Rankine cycle installed before 1 January 2017. Fitting approved automatic leak detection doubles the interval.

Does a small office air conditioning unit need an F-Gas leak check? Usually not. A single wall-mounted split typically holds 1kg to 2kg of refrigerant, which is below the 5 tonne CO2e threshold for both R410A and R32. The obligation normally kicks in with multi-splits, larger cassette systems and VRF. Always calculate rather than assume, because the threshold depends on the specific refrigerant.

What happens if you do not comply with F-Gas regulations? You are breaking the law if you do not carry out the required leak checks or do not repair leaks. The Environment Agency can take enforcement action including civil penalties, in line with its published enforcement and sanctions policy.

Is R410A banned in the UK? No. R410A was phased out for new domestic installations from 2020, but existing R410A systems remain legal to operate and legal to refill. The virgin refill ban applies to F-gases with a GWP above 2,500 in refrigeration systems holding 40 tonnes CO2e or more, and R410A has a GWP of 2,088, so it falls outside that ban.

How long do I have to keep F-Gas records? Five years, for any equipment containing 5 tonnes CO2e or more. The Environment Agency may ask to see them during an inspection.

Is a TM44 inspection the same as an F-Gas leak check? No. They are separate legal obligations with different triggers, different frequencies and different enforcement bodies. F-Gas leak checks are triggered by refrigerant charge size and enforced by the Environment Agency. TM44 inspections are triggered by 12kW or more of combined cooling capacity, are due at least every 5 years, and are enforced by Trading Standards.

Do I need automatic leak detection on my air conditioning? Only if the system contains F-gas equivalent to 500 tonnes of CO2 or more. For R410A that is around 239kg, which means very large VRF or industrial plant rather than typical commercial office air conditioning. Where it is fitted, it must be checked every year.