Rooftop solar can provide five hours of 'free' air conditioning a day. But is it green?

illuminem summarises for you the essential news of the day, reviewed by our editorial team. Read the full piece on Euronews or enjoy below:

🗞️ Driving the news: Europe’s solar boom is providing homes with hours of “free” air conditioning during heatwaves
• Analysis by Ember shows that a typical UK rooftop solar installation can generate enough electricity to power a 3 kW AC unit for five hours per day, helping households cope with rising summer temperatures
• Across the 1.9 million UK homes with rooftop solar, this equates to roughly 10 million solar-powered AC hours per heatwave day

🔭 The context: Air conditioning demand is soaring globally: the International Energy Agency estimates space cooling consumed 2,100 TWh in 2022, producing around 1 billion tonnes of CO₂
• With climate change intensifying heat events, Europe anticipates more than 275 million AC units by 2050
• Rooftop solar and AC are complementary technologies, as solar production peaks during hot, sunny periods when cooling demand is highest
• However, traditional AC relies on electricity (often fossil-fueled) and refrigerants, which are potent greenhouse gases
• The EU and UK are phasing out HFCs in favor of natural refrigerants by 2050 to mitigate emissions.

🌍 Why it matters for the planet: While solar-powered AC can reduce reliance on fossil-fueled electricity, widespread cooling still contributes to urban heat island effects and GHG emissions through refrigerants
• Efficient solar deployment coupled with cleaner refrigerants is critical to prevent cooling from exacerbating climate warming
• Without this integration, the rapid adoption of AC could lock in additional energy demand and greenhouse gas emissions

⏭️ What’s next: Policymakers and utilities are encouraged to expand rooftop solar deployment, incentivize high-efficiency AC units, and phase out fluorinated gases
• Investment in natural refrigerant systems, smart cooling technologies, and urban planning to reduce heat islands would determine whether solar-powered AC becomes a truly sustainable solution

💬 One quote: “The world must transition quickly to cleaner, more efficient cooling technologies while ensuring fair access to cooling, especially for vulnerable populations.” – Professor Yuli Shan, University of Birmingham

📈 One stat: Air conditioning contributed 1,750 tonnes CO₂ equivalent in 2022, accounting for 3.2 % of global greenhouse gas emissions, with efficiency gaps meaning many units are only half as effective as top-performing models

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