I write this in the middle of another long Indian summer, when the sky seems to sit lower and every surface remembers the sun. Heatwaves are not just weather events here; they are social events, logistical problems, and improvisation contests. Over the years I’ve watched — and practiced — an array of desi jugaads that mix old wisdom with new tech. Some are humble, some brilliant, and some are the perfect example of necessity breeding low-cost innovation.
Why our jugaads matter
- Heatwaves hit unevenly — slums, small towns, and single-room homes feel them worst. Expensive split ACs are not an option for most.
- Traditional approaches are low-energy and locally available; modern solutions are efficient but costly or grid-dependent.
- The best responses merge the two: inexpensive, culturally rooted hacks amplified by accessible technology.
Old-school tricks that still work
- Clay pots and the pot-in-pot refrigerator: Porous clay cools by evaporation. The pot-in-pot (matka-in-matka) keeps perishables and even a small room cooler when wet and shaded.
- Wet curtains and charpais: Hanging damp sheets in doorways and windows creates evaporative cooling as wind passes through. A woven charpai (cot) breathes better than foam beds at night.
- Whitewashing and mud plaster: Light-colored roofs reflect more sunlight; traditional lime- or mud-based plasters stabilize indoor temperatures.
- Night ventilation and thermal mass: Open windows late at night to let the cool in; thick walls retain that cool through the day.
- Roof sprinkling and rooftop gardens: A quick sprinkle cools terraces; green roofs and potted plants reduce heat absorption.
Simple low-tech devices I see in streets and homes
- Fan + ice jug: A floor fan blowing over a tray of ice or frozen bottles is a quick, temporary chill.
- Evaporative coolers (desert coolers): In dry inland areas, these use water and a fan to drop temperatures with far lower power than ACs.
- Reflective sheets and local shades: Old bedsheets or mylar reflectors tied on balconies dramatically lower heat exposure.
The new tech that complements jugaad thinking
- Rooftop solar powering fans and small coolers: Solar combined with battery-backed DC fans keeps sleeping areas comfortable without grid power.
- Energy-efficient inverters and split AC modes: Modern inverters reduce running cost; inverter-driven compressors modulate power rather than cycling at full blast.
- Low-cost sensors and community alert apps: SMS and app-based heat alerts let neighborhoods plan cooling hours for shared spaces.
- Phase Change Materials (PCMs) and cool paints: New materials that absorb heat at certain temperatures can smooth indoor spikes; reflective and cool-roof paints reduce roof surface temps.
How the mix works in practice
I’ve seen this pattern repeatedly: a household uses a clay pot and wet curtains by day, then at dusk folds the wet sheets and switches on a solar fan charged during the day. Neighbors set up a shaded community corner with a few chairs, a solar-powered fan, and a big pot of lime water — a public jugaad that cools people who cannot afford home ACs.
This hybrid approach reduces peak electrical demand and spreads comfort more equitably. It’s a kind of social engineering born from daily survival.
A quick checklist of actionable ideas (try one, two, or all)
- Put a wet clay pot or wet cloth near a window with a fan blowing through it.
- Whitewash or paint roofs with reflective paint before summer peaks.
- Freeze water bottles and place them in front of a fan for short-term cooling at night.
- Plant shade trees or install cheap shade nets above terraces and balconies.
- If possible, add a small rooftop solar panel for a DC fan and LED lighting — it extends comfort hours cheaply.
Where policy and design can help
- Subsidies for rooftop solar combined with battery incentives make solar fans and coolers practical for low-income households.
- Community cooling centers (shaded, ventilated, with potable water and charging points) reduce mortality and share resources efficiently.
- Building codes that encourage reflective roofs, courtyards, and cross-ventilation would institutionalize what traditional architecture offered naturally.
A note about the long view
These are not permanent fixes for a planet warming under our watch. We should celebrate jugaad for its creativity and community value, but also push for structural change: resilient cities, reliable cooling for all, and clean energy at scale. I’ve written earlier about solar’s potential to change everyday life (Sun our Soul (a new SOS)) and about distributed energy ideas that make local solutions feasible (Solar Power : at Rs 1 / kwh ?). Those threads come together here: traditional wisdom plus cheap, distributed tech is a practical bridge.
If you live in India and have tried a homemade cooler or a community cooling solution, write to me — I love hearing specific, lived stories. They are the best data.
Regards,
Hemen Parekh (hcp@recruitguru.com)
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