Is district cooling the solution we need for extreme heat in cities?
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- District cooling systems operate at twice the efficiency or half the operating expense of a typical in-building chiller plant, according to Rob Thornton of the International District Energy Association
- Dubai's state-backed district cooling company pumps around 6 gigawatts of refrigeration — equivalent to freezing 1.5 million tonnes of ice per day — to more than 1,700 buildings
- Paris's district cooling system has cut electricity and emissions by half versus individual cooling, while a simulated 37-building network in Hong Kong consumed 15% less energy and 10% lower operational costs
- The United States has about 500 district cooling networks, mostly on university and hospital campuses, while Europe has roughly 200, concentrated in France and Sweden
- The record June heatwave in Europe — one of four major heatwaves there this summer — is estimated to have killed more than 20,000 people, and only about 1-in-5 European households have air conditioning
- A 2025 European Union Covenant of Mayors report concluded district cooling can both cool cities and cut emissions, whereas air conditioning worsens carbon emissions and urban heat islands
- Ambient loop systems, which combine district heating and cooling in one pipe network, have been installed at upscale projects like Bankside Yards in London, but wider adoption will probably need government backing
Why it matters: With Europe's June heatwave estimated to have killed more than 20,000 people and only 1-in-5 European households owning AC, municipalities in dense cities like Paris and Stockholm now have a proven blueprint — Paris has already halved its cooling emissions — but the technology costs hundreds of millions of dollars to install and works best where district heating tunnels already exist, putting mid-sized dense European cities in the strongest position to act.
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