> Ruan said painting a roof of 93 sq metres (1,000 sq ft) would give a cooling power of 10 kilowatts: “That’s more powerful than the central air conditioners us

> Ruan said painting a roof of 93 sq metres (1,000 sq ft) would give a cooling power of 10 kilowatts: “That’s more powerful than the central air conditioners used by most houses.” Wow, that's impressive. With rather basic changes in home-building we can reduce climate change effects significantly, while saving a ton of money now and in the future.