Decarbonized Air Conditioning: The Right to Cool Without Ecological Disaster (French version - FR)
Technical and Strategic Note — Éric Jacob, Engineer (Maths-Sup, DEA)
The Hypocritical Paradox of Cooling
Air conditioning is demonized in ecological discourse — portrayed as a polluting luxury that should be banned or taxed. Yet cooling is already everywhere, accepted, and considered essential:
- Refrigerators and freezers in every household
- Cold rooms in supermarkets and food warehouses
- Operating theaters and recovery rooms in hospitals
- Morgues and medication storage
- Data centers (massive and permanent cooling)
- Trains, planes, and transport vehicles
No one proposes banning refrigerators. The debate on residential air conditioning is therefore primarily a class debate — the cooling of the rich (shopping centers, air-conditioned offices) versus the cooling of the poor (un-air-conditioned housing where people die during heatwaves).
In France, the 2003 heatwave killed more than 15,000 people. The 2019 heatwave killed more than 2,500. Those of 2022, 2024, and 2026 follow a trend of continuous worsening. Refusing air conditioning to vulnerable populations in the name of ecology means condemning the most fragile to die from the heat.
The Thermodynamic Truth
A heat pump (air conditioner) does not create heat — it moves it. It takes indoor heat and rejects it outdoors. In first approximation, the overall thermal balance is close to zero: the cold created on one side and the heat rejected on the other balance out thermodynamically.
The real ecological problem with current air conditioning lies elsewhere:
- Electricity consumption — mostly produced from carbon-based or nuclear sources that generate real anthropogenic heat
- HFC refrigerants — greenhouse gases with a warming potential hundreds to thousands of times greater than CO₂ in case of leaks
These two problems have known and available technical solutions.
The Solution: Air Conditioning Powered by Haffner Modules
Eliminating the Electricity Problem
A hospital, nursing home (EHPAD), or residential neighborhood powered by Haffner modules produces its electricity locally from residual biomass, with a negative carbon balance thanks to the co-produced biochar. This electricity powers air conditioners without net fossil energy consumption and without CO₂ emissions.
The anthropogenic heat generated by electricity consumption is therefore offset by the active carbon sequestration produced simultaneously by the same module.
It is the only system in the world that allows air conditioning while decarbonizing the atmosphere at the same time.
Eliminating the Refrigerant Problem
Technologies using natural refrigerants already exist:
- CO₂ (R744): natural fluid, warming potential = 1 (reference)
- Ammonia (R717): natural fluid, warming potential = 0, highly efficient
- Propane (R290): natural fluid, warming potential = 3
Haffner produces ammonia from its syngas via the Haber-Bosch process. A Haffner module can therefore power air conditioning systems using self-produced ammonia — eliminating both carbon-based electricity consumption and synthetic refrigerants.
Priority Applications: Protecting the Most Vulnerable
Hospitals and Nursing Homes (EHPAD)
Healthcare facilities are doubly concerned: they house the populations most vulnerable to heat, and they consume massive amounts of continuous energy. An on-site Haffner module enables:
- Air conditioning of all premises without additional grid costs
- Self-produced electricity for critical medical equipment
- Total resilience in case of power outages (complete independence)
Social Housing and Disadvantaged Urban Areas
These are the populations most exposed to heatwaves and the least equipped with air conditioning. A shared Haffner module at the neighborhood or condominium scale enables decarbonized collective air conditioning at a shared cost, making it financially accessible.
Schools and Daycares
Children are among the most vulnerable to heatstroke. School buildings, designed for temperatures of another era, become dangerous during heatwaves. A neighborhood module can power multiple schools simultaneously.
A Financing Model Based on Autonomy Gains
Decarbonized air conditioning does not have to be an additional cost. The gains generated by the energy autonomy provided by Haffner modules naturally finance air conditioning equipment:
| Savings Achieved | Estimated Amount | Possible Use |
|---|---|---|
| End of grid electricity bill | 30-60% of energy costs | Financing air conditioners |
| Biochar carbon credits | €110-140/t CO₂ | Equipment for at-risk zones |
| End of dependence on fossil fuels | Variable | Resilience investment |
A portion of the structural savings achieved through Haffner modules can be directed toward equipping the most heat-risk-exposed areas with air conditioning — with priority given to social housing, nursing homes, and schools.
The Long-Term Vision: Less Air Conditioning Thanks to More Biochar
There is an even deeper logic. The biochar co-produced by each Haffner module sequesters carbon in soils for centuries. If millions of modules are deployed worldwide, atmospheric CO₂ concentration gradually decreases. The greenhouse effect weakens. Extreme temperatures recede.
Haffner-powered air conditioning is therefore a transitional solution that contributes to progressively making air conditioning less necessary.
It is the only coherent scenario: we air-condition today to protect populations, using energy that decarbonizes the atmosphere, which in turn reduces the need for air conditioning tomorrow.
What the State Must Do
- Authorize and encourage air conditioning in social housing, nursing homes, and schools, provided it is powered by local decarbonized energy
- Link air conditioning authorizations to energy sources: air conditioning powered by a Haffner module (carbon-negative) is not comparable to air conditioning on a carbon-based grid — regulations must reflect this
- Direct a portion of carbon credits generated by the modules toward equipping priority thermal risk zones
- Regulatory fast-track for installations combining Haffner modules + collective air conditioning in public buildings
Conclusion
Refusing air conditioning in the name of ecology when it is powered by carbon-negative energy is an intellectual contradiction. The question is not “cooling or no cooling” — it is “what energy to produce this cooling.”
With Haffner, the answer is clear: local, decarbonized, profitable without subsidies energy that sequesters carbon while it cools. The right to cool and climate responsibility are not incompatible. They converge, if we choose the right technology.
Linkedin: Eric Jacob
Basic private research @ | Multiple Degrees in Physical Measurements | Energy transition advisor