- 1In France, the electricity consumed by air conditioning has a small carbon impact. France's very low-carbon electricity mix makes it 5 to 10 times less emissions-intensive than elsewhere in Europe. Attention therefore shifts to refrigerant leaks and impacts that carbon calculations do not show.
- 2In France, refrigerant leaks outweigh electricity. For an R32 split system losing 5% of its charge each year, they represent around 2 times the emissions from electricity consumed; with the older R410A, whose GWP is 3 times higher, the gap widens further. They do not appear on the bill, and this is what F-Gas regulation seeks to address.
- 3The solution differs depending on what you examine. Carbon depends on use (electricity and refrigerant leaks), metal resource depletion on manufacturing, and the ozone indicator on refrigerant production.
- 4The F-Gas timetable tightens from 2027. Refrigerants with a GWP of 150 or more will be prohibited when placing monobloc air conditioners of 12 kW or less on the market from 1 January 2027, then air-to-air split systems of the same capacity from 1 January 2029. R32 and R454B (GWP 466) will then disappear from these small models in favour of refrigerants such as R290 (propane), with a near-zero GWP. Equipment bought today can still be used and maintained after these dates.
When offices exceed 30 °C during a heatwave afternoon, the question arises in every corridor: install air conditioning, but at what environmental cost? This article first gives a carbon estimate, then explains what that figure does not cover, and finally offers a multicriteria assessment whose verdict changes with the indicator examined. Cooling needs also depend on location: the number of tropical nights by municipality by 2050 ranges from 3 to more than 70 depending on the area.
1How much CO₂ does air conditioning emit in France?
The calculation relies on multiplication: energy consumed × electricity emission factor. We are discussing a product carbon footprint here, rather than an organisation's Bilan Carbone®: the former measures the CO2 emissions from equipment and its use, the latter all emissions from an organisation. In France, this factor is low: around 30 gCO2e/kWh over the life cycle according to RTE 2024, or around 10 times less than in Germany, more than 20 times less than in Poland and around 7 times less than the European average. This still does not allow claims of carbon-neutral air conditioning: an organisation's neutrality remains a legally regulated concept. An air conditioner is technically an air-to-air heat pump: it does not produce cold, but moves heat from inside to outside. This thermodynamic principle is the same for a portable monobloc (2-3 kW cooling capacity, occasional cooling for one room), a wall-mounted split (2-7 kW, living room or small office), a commercial VRF/VRV system (15-150 kW, multi-zone building with energy recovery between simultaneously hot and cold zones), or a reversible air-to-water or ground-source heat pump. Comparing their SEER (Seasonal Energy Efficiency Ratio) alone is therefore insufficient: installed cooling capacity and actual use matter just as much.
Estimate your air conditioning's carbon impact
SEER 7, 0.18 kg of refrigerant per kW cooling capacity, volume 250 m³, cooling capacity 7.0 kW
The integrated calculator lets you simulate a specific case: floor area, ceiling height, equipment type, refrigerant, months of use, European country. Real-time output: consumption, cost, annual emissions and cumulative emissions over 17 years (typical lifespan), comparison of the grid's average and peak mixes. The resulting use-phase footprint is then complemented by the multicriteria assessment.
2Urban heat islands and rebound effects: two mechanisms outside the calculation
This calculator already goes further than a conventional carbon footprint assessment: it separates CO₂ emissions from electricity use and refrigerant leaks, and offers a heatwave "grid peak" view. Yet two mechanisms remain invisible and matter at a collective scale:
- The urban heat island. An air conditioner does not eliminate heat; it expels it outside. Across a dense neighbourhood, this raises the outdoor temperature by 1 to 2 °C at night (Salamanca et al. 2014, Journal of Geophysical Research: Atmospheres), prompting neighbours to use more air conditioning. Cerema maps this sensitivity free of charge for 12,000 municipalities, and it is one of the measures documented in our guide to adapting a territory. No individual carbon footprint captures this social and environmental cost.
- The rebound effect (Jevons paradox). Once air conditioning is installed, it is used for longer and at a lower setpoint than planned. Studies of the direct rebound effect (Greening et al. 2000 in Energy Policy; ADEME review) put this additional consumption at 10 to 30% compared with the initial sizing scenarios.
3Multicriteria LCA: an air conditioner's 12 PEF indicators
Climate is only one of sixteen indicators in the European Environmental Footprint (EF 3.0) method. For each environmental dimension, a different LCA phase dominates: electricity use, manufacturing, refrigerant leaks or end of life. The integrated visual, based on the reference scientific report by the Joint Research Centre (the European Commission's scientific body), shows which phase contributes most to each of the 12 main PEF indicators for a residential split air conditioner.
The dominant phase varies by indicator: estimate based on the literature
Climate change is only one of 16 indicators in the European PEF EF 3.0 method, and the life cycle phase contributing most changes between indicators. With an average European electricity mix, use dominates climate and fine particulate matter; manufacturing dominates mineral and metal depletion and human toxicity; the ozone indicator comes from refrigerant production. These shares are estimates based on the literature, rather than an LCA. Click a bar for details.
Dominant for 8 of 12 indicators with an average European mix. In France, the low-carbon mix substantially reduces this share.
Metals 70%, human toxicity 50%. Copper, nickel, electronic rare earths. Invisible in use.
Leading climate source in France, ahead of electricity. Measures: R290 and leak-tightness; F-Gas excludes R32 from new splits of 12 kW or less in 2029.
Of 12 indicators, 8 are dominated by the use phase (climate, particulate matter, acidification, eutrophication, fossil resources, ionising radiation, land, water), where electricity matters and, for climate, refrigerant leaks. This is what the calculator and carbon footprint capture, just as the scope 3 of a Bilan Carbone® isolates an organisation's indirect emissions. Minerals and human toxicity, however, shift towards manufacturing (copper, nickel, electronic rare earths). The ozone indicator mainly comes from the production chain for fluorinated refrigerants: HFCs themselves (R32, R410A) do not deplete the ozone layer.
4Reduce demand before installing equipment: 4 measures
The first question concerns reducing demand before choosing equipment. 4 measures quantified by ADEME reduce cooling demand by 30 to 80%, allowing smaller equipment to be sized afterwards, or none at all.
- External solar protection (external venetian blinds, solar shading, shutters) cuts up to 80% of solar gains on an exposed façade, or up to 30% lower air conditioning demand (ADEME 2023). This is the most cost-effective measure in an existing office.
- A ceiling fan consumes 30 to 60 W, compared with 500 to 900 W for a 2.5 to 3.5 kW split at full load, or 10 to 15 times less. Combined with a thermostat set 2 to 3 °C higher, it saves around 30% of air conditioning consumption without loss of perceived comfort.
- Night-time free cooling cools the building at night with outdoor air through increased mechanical ventilation, with typical savings of 5 to 35 kWh/m²/year in commercial buildings (ADEME 2024).
- Setting the thermostat to 26 °C rather than 24 °C reduces consumption by around 14% (7% per degree), immediately and at no cost, in line with energy-saving recommendations.
- If the project allows, a reversible air-to-water or ground-source heat pump beneficially replaces conventional air-to-air conditioning in new buildings or major office renovations. SEER 4-6 for air/water, 5-8+ for ground-source (compared with 3-8 for a high-end split), with much more stable performance during heatwaves (ground temperature at -3 m stays around 12-14 °C). Higher investment (€10-25k for residential ground-source versus €1-4k for a split), but a substantially lower cumulative footprint over 20 years.
None of these measures excludes an air conditioner; they build on one another. This is the logic of an eco-design process applied to thermal comfort: reduce demand first, then optimise equipment. Alternatives to air conditioning (fans, ceiling fans, evaporative cooling, district cooling) are covered separately.
5Key takeaways
- In France, the electricity consumed by an air conditioner emits 5 to 10 times less CO2 than elsewhere in Europe thanks to a low-carbon electricity mix: refrigerant leaks become the leading source of use-phase emissions.
- Calculating carbon from electricity is insufficient: refrigerant leaks, the peak mix, urban heat islands and rebound effects must be included. The calculator covers part of this; multicriteria LCA complements the rest.
- Before buying, measures to reduce demand (solar protection, ceiling fans, free cooling, a 26 °C setpoint) can reduce cooling demand by 30 to 80%. Details are in our article on alternatives to air conditioning.
- The F-Gas timetable distinguishes equipment: Regulation (EU) 2024/573 prohibits placing self-contained equipment (monobloc, plug-in) of 12 kW or less using a refrigerant with GWP 150 or more on the market from 1 January 2027, and air-to-air split systems of the same capacity from 1 January 2029. The prohibition concerns placing on the market: an R32 unit bought in 2026 can still be used and maintained after that date. Since 1 January 2026, however, refrigerants with a GWP of 2,500 or more have been prohibited for maintenance without any charge threshold, making equipment still charged with R-404A impossible to recharge with virgin refrigerant.
Equipment choices made this year commit the company for 15 to 20 years. To include this source in a formal Bilan Carbone, see how much a Bilan Carbone® costs.
