Paint me cool: scientists reveal roof coating that can reduce surface temperatures up to 6C on hot days

<p>Sydney researchers commercialising a product they say can cool indoor spaces and will cost little more than standard premium paints</p><ul><li><p><a href="https://www.theguardian.com/environment/2025/mar/10/sign-up-for-the-clear-air-australia-environment-newsletter-with-adam-morton?CMP=cvau_sfl">Sign up for climate and environment editor Adam Morton’s free Clear Air newsletter here</a></p></li></ul><p>Australian scientists have developed roof coatings that can passively cool surfaces up to 6C below ambient temperature, as well as extract water from the atmosphere, which they say could reduce indoor temperatures during extreme heat events.</p><p>Heatwaves are becoming more intense, <a href="https://www.theguardian.com/news/2025/sep/25/australias-horrifying-climate-future-in-four-charts-and-how-we-can-avoid-the-worst">more frequent</a> and <a href="https://www.theguardian.com/australia-news/2025/sep/17/heatwaves-caused-more-than-1000-deaths-in-australia-over-four-year-period-study-finds">more deadly</a> due to human-caused global heating.</p> <a href="https://www.theguardian.com/environment/2025/oct/31/scientists-invent-roof-coating-reduce-indoor-temperatures-hot-days">Continue reading...</a>