Blinds shut tight. Heat presses against the glass. You want to breathe, but the air refuses to move.
June 2024 was brutal. Temperatures in France skyrocketed past 40 degrees Celsius. People didn’t just want cooling, they needed it. Shoppers literally crashed into stores. Portable fans vanished. AC units were snatched up in minutes.
This panic buying won’t be an anomaly.
The planet is getting hotter. The International Energy Agency predicts a massive shift by 2050: two-thirds of households globally could own air conditioning. Europe? It’s waking up late. Right now, only about 20% of Europeans have AC at home. The UK trails at a mere 4%. Compare that to the US, where 90% of homes are chilled, fueled by dirt-cheap electricity.
But the AC debate in Europe isn’t just about temperature. It’s a political cudgel.
Marine Le Pen promised universal AC for France. British Conservatives vowed to slash net-zero rules that restrict cooling in new builds. Then you have the left arguing AC is a luxury for the rich. They warn of an “American-style” energy trap, where we burn more power to escape the heat caused by burning more power.
Sound cynical? Maybe. But heat kills.
In 2019 alone, AC prevented nearly 200,so 200 premature deaths in people over 65. That’s not comfort. That’s survival. Europe is warming faster than any continent on Earth. Norway, Finland, the UK? These places with “mild” summers are facing extreme heat waves that feel alien.
“We will need more cooling to protect people,” says Nicole Miranda, a lecturer at Oxford. “But not by panic-buying inefficient portable ACs.”
Current housing is designed to trap winter heat. In a summer heat wave, those same homes turn into ovens. The Climate Change Committee warns that by 2050, over 90% of UK homes could overheat during severe spells. Ancient tricks—thick walls, small windows, shutters—are failing. They can’t block enough sun.
So we turn on the AC.
Here is the dirty secret.
The machine keeping you cool is heating the planet. ACs account for 3% of global greenhouse gases. More than aviation. If we install more units as predicted, electricity demand for cooling could triple by 2055.
Solar helps. But the core tech? It’s stuck in the past.
Conventional ACs pump refrigerants around. Many of these chemicals—fluorinated gases—are thousands of times worse for the atmosphere than CO2. The EU banned them in 2024. Good luck replacing them. Propane burns. Ammonia poisons you. It’s a bad choice of chemicals.
Enter: solid-state cooling.
Forget the gas. Think metal. Think magnetism. Think physics.
Paul Motzki at Saarland University is working on nickel-titanium alloys. Stretch the metal. Release it. It snaps back and absorbs heat. No gas needed. No leaky pipes. Just a cool room. Motzki thinks this could cut room temps by 5 to 1C more efficiently than today’s bulky machines.
Others are trying different angles:
– Mimic Systems uses semiconductors to push heat through apartment walls.
– Magnotherm uses magnetic fields (starting with fridges).
– Barocal in Cambridge squishes plastic crystals to release heat. They raised $10 million recently.
Is this the future?
“Europe is at the forefront,” Motzki says. “But we need capital.”
Lindsay Rasmussen from Third Derivative agrees. The tech is promising. It’s early. Unproven at scale. She compares it to solar. Research starts in Europe. Commercialization happens in the US. Mass manufacturing happens in Asia.
Where does solid-state cooling end up? Probably in Asia, picked up by giants like Samsung or Daikin who watch these labs like hawks.
Prime Day is coming. Prices on window units will drop. Buy them if you want.
But installing more AC won’t fix Europe’s heat problem. Our cities are concrete boxes. We need to cool the boxes, not just the rooms inside them.
Miranda and the IEA advocate a “cooling hierarchy”:
1. Keep the heat out first (trees, shade, reflective paint).
2. Ventilate naturally.
3. Use AC only where critical (hospitals, schools, elderly care).
Paris did this before the 2024 Olympics. They piped cold river water underground to cool public buildings. Smart. Efficient. Local.
Policy makers are starting to realize we have to adapt. The waves of heat are getting taller.
We can build better machines. We can import technology from the East. But will we plant the trees in time?
That part is up to us. And honestly? It feels like we are already late.
