In 2018, a Hawaii study found green roofs stayed cooler than white roofs in Honolulu

Sep 5, 2026 - 16:30
In 2018, a Hawaii study found green roofs stayed cooler than white roofs in Honolulu

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A University of Hawaii study found green roofs stayed cooler than white roofs. The green roof's average daytime surface temperature was 4.1°F lower. Peak temperatures on the green roof were 18.5°F lower than the white roof. Evapotranspiration from plants cooled the surrounding air significantly. This vegetation offers a method to combat urban heat island effects.

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