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Emission factor from NAEI 2026

Stationary Air-Conditioning: Heat pumps, small - Halocarbon used for manufacturing: HFC-134a

United Kingdom · Fugitive releases · 2024 onwards

Each kilogram of Halocarbon used for manufacturing: HFC-134a released to the air from 2024 counts as 0.005 kg CO₂e, its 100-year warming potential under IPCC AR5.

Value for Halocarbon used for manufacturing: HFC-134a, per kg leaked

0.005kgCO₂e/kg

Leak to air · GWP100 · IPCC AR5

2024–
Default: the latest yearUnchanged on 2023

1 kg leaked = 0.005 kg CO₂e

The same warming over 100 years as releasing 0.005 kg of carbon dioxide.

Refrigerant you topped up this year

1 kg= 0.005 kg CO₂e

No top-up records? Charge × yearly leak rate gives the kilograms.

Region
United Kingdom GB
Boundary
Fugitive releases
Data quality
HighRated by us, not by the source
Licence
Open · OGL v3.0

Where 0.005 comes from

Published as one number

NAEI prints this factor as a single figure, with no parts to add up.

Reporting this kilogram under the GHG Protocol

Scope 1 0.005

Gas that escapes from equipment you run is a direct emission, so it is your Scope 1.

CiteAPI

The factor, standardised

Every factor on open-climate.ai answers the same questions in the same words, whatever the publisher. Open any ⓘ for the definition.

Direct emissions › Fugitive emissions and refrigerants · United Kingdom · per kg · Average

Fugitive releases · Excl. biogenic CO₂ · AR5

Boundary
Fugitive releases
GWP method
IPCC AR5, 100-year horizon
As printed by NAEI
CO₂e basis
Excl. biogenic CO₂FossilBio CH₄Land useBio CO₂GHG Protocol and IPCC inventories

High quality · Open licence · 1996 to now

Every horizon, every IPCC report

A warming potential rests on two choices: how many years of warming are counted, and which IPCC assessment report supplies the numbers. NAEI publishes one of these 9 cells; the other 8 read “Not published by NAEI”.

This factor0.005 AR5, GWP100
Cells published for this gas1 of 9 100 years only
kgCO₂e per kg of Halocarbon used for manufacturing: HFC-134a leaked, by horizon and IPCC report. Pick a cell to read it.
AR4IPCC, 2007AR5IPCC, 2013AR6IPCC, 2021
GWP2020 years
Not published by NAEI
Not published by NAEI
Not published by NAEI
GWP100100 years
Not published by NAEI
Not published by NAEI
GWP500500 years
Not published by NAEI
Not published by NAEI
Not published by NAEI

Default: what search and the API return when you ask for nothing specificNot published by NAEI

What this number covers

One step: refrigerant leaving your equipment. Your records give the kilograms; the factor converts them.

  1. Refrigerant in your equipment

    The charge in a heat pump, air-conditioning unit or chiller. No emission while it stays in the circuit.

    Starting point, not counted

  2. Leak to air

    Refrigerant lost through seals and joints, during servicing, or in a failure. Counted as the kilograms you top up.

    Included1 kg

  3. Warming over 100 years

    Heat trapped by that kilogram, compared with 1 kg of CO₂: its GWP100 from the IPCC's fifth report.

    Included× 0.005

  4. Your footprint

    1 kg leaked, reported as CO₂e.

    = 0.005

Outside this boundary

  • Making the refrigerant
  • Recovery at end of life
  • Power the unit uses

Buying the gas is Scope 3, category 1, with its own factor, not this one.

A warming potential, not a measurement

Nobody measured this number at a site. It is the warming caused by 1 kg of the gas over 100 years, divided by the warming of 1 kg of CO₂. It is the same wherever the leak happens.

kg leaked × 0.005 = kg CO₂e

From NAEI's record to a comparable factor

NAEI publishes this factor as one record. Here is each field as printed and what open-climate.ai made of it.

About this factor

Filed by NAEI under

Industrial Processes and Other Product Use

NAEI gives no description for this factor.

Source and licence

Publisher
UK National Atmospheric Emissions Inventory (NAEI), compiled for Defra and DESNZ by Ricardo Energy & Environment
Library
NAEI 2026
Open the record at NAEI
Open Government Licence v3.0 Open

The values and their metadata are served in full and may be reused with credit to the publisher.

Credit it with this line(c) Crown 2026 copyright Defra and DESNZ via naei.energysecurity.gov.uk, licenced under the Open Government Licence (OGL).
A plain reading of the licence, not legal advice. The licence text prevails.

Cite this factor

(c) Crown 2026 copyright Defra and DESNZ via naei.energysecurity.gov.uk, licenced under the Open Government Licence (OGL). Normalised by open-climate.ai, https://open-climate.ai/factors/libraries/naei_uk/ (CC BY 4.0). https://open-climate.ai/factors/ef-naeiuk-stationary-gb-kg-fugitive-076d5985/?v=efv1-42b1cbabd3ea87829c6c10c4606cc13c

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