HVAC

F-Gas Regulation and TM44 inspections explained

4 min read · Updated 11 June 2026

The F-Gas Regulation governs fluorinated greenhouse gases used as refrigerants. Operators of stationary refrigeration and air-conditioning equipment must prevent leaks and keep records for each system.

Leak checks and frequency

Frequency depends on the CO2-equivalent charge of the system: broadly at least every 12 months for systems of 5 tonnes CO2e or more, more often for larger charges, with a fixed leak-detection system reducing the required frequency.

Records you must keep

  • Refrigerant type and quantity per system
  • Dates and results of leak checks
  • Quantities of refrigerant added or recovered
  • The certified company or technician who did the work

TM44 air-conditioning inspections

Air-conditioning systems above 12 kW must be inspected by an accredited energy assessor under TM44, at intervals not exceeding five years, producing a report with recommendations to improve efficiency.

F-Gas on CertFlow

CertFlow tracks the refrigerant charge per system, sets the leak-check frequency automatically from the CO2e charge, and keeps the logs and TM44 reports audit-ready.

References

Sources & official guidance

Links to primary UK legislation and official regulator guidance. CertFlow is independent and not affiliated with these bodies.

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