As southern France roasted through its hottest day on record, 46°C rising like a furnace over the Camargue, a predictable but deeply charged political divide resurfaced. The French government, facing heatstroke cases spiking in the tens of thousands, quietly advised citizens to use air conditioning where available. The United Kingdom's Energy Secretary, Claire O'Hara, responded with what she called a 'call for calm' and a press conference unveiling a Green Cooling Strategy. Her statement, both urgent and measured, acknowledged the immediate human need for cooling while warning that unchecked AC use would spike carbon emissions and worsen the very heatwaves that necessitate it.
This is not a conflict of values. It is a collision of physics. Each air conditioning unit, in its thermodynamic function, pumps heat from indoors to outdoors. Multiply this by millions of units running during a heatwave, and you have a net warming effect on urban environments. The phenomenon is well known: the urban heat island, amplified by AC exhaust, can raise local temperatures by 1-2°C. In a heatwave, this feedback loop accelerates. More heat leads to more AC use, which leads to more heat. The grid strains. Emissions rise. And the poorest, often without AC or adequate insulation, bear the brunt of both the heat and the energy bills.
O'Hara's strategy, detailed in a memo released to the press, focuses on three pillars: passive cooling through building design, shifted energy demand to non-peak hours, and a push for heat pumps that can run on renewable electricity and also warm homes in winter. It is sensible. It is also slow. Physical infrastructure takes decades to retrofit. Meanwhile, the political pressure to subsidise air conditioning units grows with every heat-related death. France, which has historically resisted widespread AC installation due to cultural preferences for stone buildings and shutters, now sees supermarkets selling portable units faster than they can stock them.
The data is stark. Global air conditioning energy demand has tripled since 1990. By 2050, the International Energy Agency projects it could rival the entire electricity consumption of the European Union today. In the developing world, where AC penetration is low but rising, this growth is both necessary and terrifying. A hotter planet requires cooling, but cooling requires energy, and energy, if not decarbonised rapidly, will cook the planet further.
O'Hara's challenge is not technological. Heat pumps, solar-powered AC, and district cooling systems exist. The challenge is political: how to implement these solutions at scale without punishing the vulnerable. The UK strategy includes financial incentives for low-income households to install heat pumps and better insulation. But critics note that such schemes often favour homeowners over renters, and retrofitting tower blocks is notoriously difficult.
This is where the 'calm urgency' must translate into action. We are not talking about a future crisis. The hottest day in France is now. The UK's hottest day, 40.3°C in 2022, is already behind us. Each heatwave brings a new record. Each record brings a new wave of AC installations. The political divide is not between those who want to cool the population and those who do not. It is between those who want to cool with fossil fuels in the short term, and those who advocate for a managed transition to a renewable-powered cooling grid. The dividing line is not ideology but timescale.
The Earth's energy balance does not care about political cycles. It only responds to the concentration of greenhouse gases and the albedo of urban surfaces. Every air conditioning unit sold today that runs on coal-fired electricity adds to the problem. Every unit that runs on solar power, with efficient thermal storage, is part of the solution. The strategy must be ruthless in its focus on the highest leverage points: banning the most inefficient units, tightening building codes, and investing in geothermal district cooling for new developments.
This is not a call to forgo cooling. Heat stroke is deadly. But we must realise that the way we cool today is destroying the livability of tomorrow. The political divide, if it becomes entrenched, will lead to a patchwork of haves and have-nots: those who can afford solar-powered AC and those who suffer through heatwaves without it. The climate crisis has many fronts. This one, the cooling front, is where daily life and global physics meet. The UK's Green Cooling Strategy is a start. But it must be implemented faster than the next heat record.
