Ancient Jaali Screens: India’s Timeless Answer to Scorching Heat

Picture a summer day in India where the mercury edges close to 50 °C, yet inside a palace the air feels comfortably cool. No electricity, no fans, just stone, geometry and a whisper of wind. That is the story of the jaali – a perforated lattice that has been cooling spaces for over a millennium.

The origins of jaali screens stretch back to at least the 8th century, with early examples gracing the walls of the Kailasa Temple at Ellora and the temples of Pattadakal. Later, Mughal artisans blended Persian ornamental patterns with native stone‑carving skills, turning the jaali into an art form as much as a climate‑control device.

What makes a jaali work isn’t magic; it’s physics. As air is forced through the tiny openings, it accelerates and expands, a process that naturally drops its temperature. Studies of surviving structures show that interior spaces can be 4‑5 °C cooler than the outside, all without a single watt of power.

And the designs weren’t one‑size‑fits‑all. In the blazing deserts of Rajasthan, craftsmen favoured dense, tightly‑spaced patterns that blocked harsh sunlight while still allowing a gentle breeze. Down in Kerala’s humid coast, the lattices are more open, inviting sea breezes to flow straight through. Every motif was a response to local climate, material and purpose.

Some of India’s most iconic monuments showcase jaali mastery. The Hawa Mahal in Jaipur, with its 953 tiny windows, was essentially a giant ventilator for royalty. The Sidi Saiyyed Mosque’s celebrated “Tree of Life” screen even inspired the logo of IIM Ahmedabad. And the ethereal glow inside the Taj Mahal owes much to its delicate marble jaalis, which filter light into a soft, luminous haze.

Even today, cities like Jaipur, Jodhpur, Jaisalmer, Agra and Makrana nurture generations of artisans who chisel each opening by hand, balancing aesthetics, airflow and structural integrity. Their patience and skill keep a tradition alive that modern architects are now looking to for inspiration.

With heatwaves becoming more intense across the subcontinent, the old‑world jaali is experiencing a renaissance. Contemporary designers are re‑interpreting these stone screens with new materials and digital fabrication, hoping to recapture that effortless cooling while meeting today’s sustainability goals. It’s a reminder that sometimes the smartest technology is the one that’s been hiding in plain sight for centuries.