As Indian summers grow longer and hotter, especially in cities packed with concrete and metal, beating the heat is becoming harder — and more expensive. Air conditioners aren’t always an option, especially for low-income families. That’s why a surprisingly simple idea is catching on in many parts of the country: painting rooftops white.

It may sound too easy to work, but this technique — called cool roofing — is helping homes stay a few degrees cooler without using a single unit of electricity. It’s affordable, low-tech, and making a real difference.

So, what exactly is a cool roof?

Think of it like this: On a sunny day, wearing black makes you feel hotter, right? That’s because dark colours absorb more heat. Now, imagine your roof doing the same thing. A regular concrete or metal roof can heat up to 65°C or more. But a white-painted roof? It can be up to 28°C cooler.

That’s the whole idea behind a cool roof. By applying a special white or reflective paint, rooftops bounce sunlight away instead of soaking it in. The result? Cooler rooms underneath, even without fans or ACs running all day.

What’s the big deal? Turns out, a lot

For families in small or poorly ventilated homes, even a 2–5°C drop indoors can be a game-changer. Here’s what cool roofs are helping with:

• Lower indoor temperatures: This is the most immediate benefit. Homes become noticeably more bearable during the hottest hours.
• Reduced electricity bills: Less need for fans and coolers means more money saved.
• Better sleep and comfort: Residents report sleeping better and feeling less fatigued.
• Environmental impact: Using less electricity also means fewer emissions. It’s good for your home and good for the planet.
• Tackling the “urban heat island” effect: Cities tend to trap more heat than rural areas. White rooftops help reflect some of that heat away.