New research shows painting roofs white is the most effective way to cool cities during heatwaves, even more than 'green roofs'.
Struggling with scorching summers? A London study reveals a surprising solution: cool roofs! Discover how they can dramatically reduce urban heat.A new study by University College London researchers suggests painting roofs white or covering them with reflective coatings could be the most effective way to cool cities like London during scorching summer days., compared the effectiveness of various passive and active urban heat management systems.
“We comprehensively tested multiple methods that cities like London could use to adapt to and mitigate warming temperatures, and found that cool roofs were the best way to keep temperatures down during extremely hot summer days,” Dr. Oscar Brousse, of UCL’s Bartlett School of Environment, Energy & Resources and lead author of the study, said in a
The study also highlighted the potential drawbacks of air conditioning. While it cools buildings, it expels heat outdoors, further warming the urban environment. The researchers found that extensive air conditioning use could raise outdoor temperatures by an average of 0.15 degrees Celsius across London, with a more significant increase of 1 degree Celsius in dense central areas.
While green roofs didn’t offer a significant overall cooling effect, the study did find variations throughout the day. During peak heat hours, widespread green roofs could lower temperatures by 0.5 degrees Celsius . However, this benefit was offset at night, as the roofs retained heat and released it after sunset, raising nighttime temperatures by a similar amount.
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