What SFG20 actually says about air conditioning maintenance

The short version

"SFG20 compliant" appears in almost every commercial maintenance quotation, and on its own it means very little. SFG20 is a library of task schedules, not a single standard you either meet or do not — so the meaningful questions are which schedules have been applied to your plant, at what frequency, and what has been left out.

Our SFG20 explainer covers the standard in general. This guide is narrower: what it means specifically for air conditioning.

The colour coding, applied to AC

SFG20 rates every task by criticality, and for a building owner this is the most useful thing in it — because it tells you where a budget genuinely has flex.

Red — statutory. On air conditioning these are driven mainly by the F-Gas regime: leak checking at intervals set by refrigerant charge in tonnes of CO₂ equivalent, at the 5, 50 and 500 tonne thresholds; keeping records of quantities, checks, repairs and verification; and having the work done by certified engineers through a certified company. Where a system serves a wet cooling circuit, ACOP L8 Legionella control is also red.

Amber — optimal. Filter changes, coil cleaning, condensate management, fan and bearing checks, controls verification. None of these is legally mandated in itself, and all of them are why a well-maintained system uses less energy and fails less often. This is where most of the real-world value of a maintenance contract sits.

Green — discretionary. Genuine flex.

Pink is added when a regime is tailored to a sector or organisation — common in healthcare, food production and other regulated environments.

The practical consequence: when maintenance spend is under pressure, cutting green is a business decision and cutting red is a breach. Most organisations that get into difficulty did not distinguish between them, because their schedule never separated them in the first place.

The duty SFG20 does not cover

This is the point worth taking away, because it catches out buildings that consider themselves well managed.

TM44 air conditioning inspections sit under the Energy Performance of Buildings Regulations rather than under any maintenance regime. Air conditioning with an effective rated output above 12 kW must be inspected by an accredited energy assessor at intervals of no more than five years, with the report lodged on the register before release.

An accredited energy assessor is not the same person as your maintenance engineer, and the inspection is a separate exercise. A fully SFG20-compliant maintenance contract does not discharge the TM44 duty. Check explicitly whether it is included — it usually is not.

The other trap is aggregation: the 12 kW threshold applies to the building's air conditioning as a whole, and units individually below 12 kW count toward it when combined. Six 3 kW cassettes is an 18 kW system with a legal duty attached. Enforcement sits with Trading Standards and the fixed penalty for not holding a report is currently £300, with a further £200 for failing to produce it within seven days of a request — confirm current levels on GOV.UK. See servicing and TM44.

Checking what your contract actually covers

Four questions will tell you most of what you need to know:

• Which schedules have been applied to my asset list? This requires an asset register. If nobody has surveyed and listed the plant, the schedule cannot be right, because it is not derived from what is actually in the building.
• Are all the red tasks included? A quote that omits statutory tasks to hit a price is cheap for a reason.
• Where have frequencies been reduced from the SFG20 baseline, and why? Reduction can be perfectly legitimate — the baseline is meant to be tuned to condition and criticality — but it should be a documented decision rather than a silent one.
• What is excluded? Consumables, refrigerant, reactive callouts, out-of-hours attendance and TM44 are the usual exclusions, and they are where superficially similar contracts diverge sharply in real cost.

A defensible regime has three parts: an accurate asset register, the schedules mapped onto it, and a record of what was actually done and when. The third is what you produce when an enforcing authority, an insurer or a warranty provider asks — and a contract delivering the first two but not the third leaves you exposed at the worst possible moment.

Frequency: where the SFG20 baseline needs tuning

SFG20 frequencies are a starting point, and air conditioning is a good example of why environment matters more than a blanket interval. Twice a year is a reasonable baseline for comfort cooling. Quarterly is more appropriate where fouling is fast or failure is expensive: commercial kitchens, where grease coats condenser coils; server and comms rooms, where plant runs continuously and downtime is costly; dusty industrial environments; and coastal sites, where salt corrodes coils and casings.

Applying one interval across an estate overspends in the clean sites and under-maintains the dirty ones. And whatever the schedule says, check it against the manufacturer's warranty conditions, which can be more demanding — a warranty declined for want of a service history is an expensive way to discover the gap.

Frequently asked questions

Is SFG20 a legal requirement for air conditioning?

No. SFG20 is an industry standard published by BESA, not legislation. What makes it valuable is that it maps to legislation — its red tasks are those driven by statutory duties, principally F-Gas leak checking for air conditioning — so it gives you an auditable way to show which parts of your regime are legally required.

Does an SFG20 contract cover my TM44 inspection?

Almost never. TM44 inspections must be carried out by an accredited energy assessor and lodged on the register, which is a separate exercise from routine maintenance by a service engineer. A building can have a fully compliant SFG20-based regime and still be in breach of the TM44 duty, so check explicitly whether it is included.

How do I know if my contractor is really following SFG20?

Ask which schedules have been applied to your specific asset list, whether every red task is included, where frequencies have been reduced from the baseline and why, and what is excluded. All of it rests on an accurate asset register — without one, the schedule is not derived from the plant you actually have.

Can we reduce maintenance frequency to save money?

On amber and green tasks, yes, as a documented risk decision. On red tasks, no — those are the statutory ones, and cutting them is a breach rather than a saving. That distinction is precisely what the colour coding exists to make visible, and it is why a schedule that does not separate them leaves you unable to cut safely.

See the SFG20 explainer, AC servicing, F-Gas and TM44, whole-building PPM and the planned versus reactive maintenance guide.