By noon, the city begins to slow down. Delivery workers pause beneath flyovers searching for pockets of shade. Commuters crowd around the narrow shadows cast outside metro stations. Inside homes and offices,
air-conditioners run endlessly as temperatures climb higher with each passing hour. Across Delhi, Hyderabad, Bengaluru, and Kolkata, heat radiates visibly off roads and buildings, turning entire neighbourhoods into concrete furnaces.
For millions across India, this is no longer an occasional summer experience. It is becoming everyday reality.
As heatwaves intensify year after year, India is confronting a growing crisis, one that affects health, productivity, infrastructure, and quality of life. But amid rising temperatures, a new generation of innovators and climate-focused startups is beginning to rethink how the country cools itself.
Instead of treating extreme heat as an unavoidable part of summer, these companies are approaching it as a solvable design challenge. From refrigerant-free cooling systems and satellite-based heat mapping to terracotta walls and mushroom-based insulation, they are building alternatives that could reshape how Indian cities survive a warming future.
India’s escalating heat problem
Many regions across the country now regularly experience temperatures above 45°C during peak summer months. Heatwaves are becoming longer, more frequent, and more intense, particularly across northwestern, central, and eastern India.
The consequences extend far beyond discomfort. Prolonged exposure to extreme heat increases the risk of dehydration, heat exhaustion, heatstroke, kidney stress, and cardiovascular complications. Outdoor workers including delivery executives, construction labourers, sanitation workers, farmers, factory staff, and street vendors, remain among the most vulnerable because they spend long hours under direct sunlight with little access to cooling.
In low-income settlements, the situation becomes even harsher. Homes with tin roofs absorb and trap heat throughout the day, often remaining unbearably hot long after sunset. For many families, recovery from daytime exposure becomes nearly impossible.
As demand for cooling rises, traditional air-conditioning presents another challenge. Conventional ACs consume enormous amounts of electricity, rely on refrigerants that contribute heavily to global warming, and release excess heat back into surrounding streets, further worsening urban temperatures.
Now, several Indian startups are trying to break that cycle.
Cooling without conventional air-conditioners
Hyderabad-based startup Ambiator is among the companies attempting to rethink cooling technology for Indian conditions.
Founded by Jeeten Desai and Tiger Aster, the company has developed a refrigerant-free cooling system designed specifically for regions experiencing extreme heat. Their product, the Ambiator 5TR, combines elements of traditional cooling systems with energy-efficient engineering to provide fresh cooled air while significantly reducing electricity consumption.
According to the company, the system uses nearly 80% less electricity than conventional air-conditioners and considerably less water than standard desert coolers. Even during peak summer conditions, it can reportedly maintain indoor temperatures between 24°C and 28°C.
The startup has focused particularly on industrial spaces, factories, warehouses, and commercial environments where extreme heat directly affects worker safety, productivity, and operational efficiency.
Using satellites to track invisible heat
While some startups are redesigning cooling systems on the ground, others are monitoring heat from space.
SatLeo Labs is using thermal satellites, drones, and artificial intelligence to map heat accumulation across cities in near real time. Rather than waiting for visible signs of danger, the company identifies hidden thermal hotspots before they escalate into larger environmental or public health risks.
Using infrared thermal imaging, SatLeo’s technology can reportedly detect overheating in landfills, industrial clusters, dense urban neighbourhoods, and areas with methane build-up, even through smoke or haze. Artificial intelligence then converts the collected data into simplified dashboards and alerts that local authorities can use for faster intervention.
In Karnataka’s Tumakuru district, the company mapped a 40-acre landfill along with city-wide heat zones to help officials identify dangerous hotspots, monitor emissions, and plan plantation drives in areas experiencing the highest surface temperatures.
The larger goal is not just monitoring heat, but helping cities respond before conditions become critical.
Rediscovering traditional cooling materials
Some of the most innovative cooling solutions, however, are emerging not from advanced machinery, but from natural materials that have existed for centuries.
Through initiatives like the Solar Decathlon India challenge, the Alliance for an Energy Efficient Economy (AEEE) has encouraged students, architects, and researchers to create affordable cooling systems that can work within existing homes without depending heavily on conventional air-conditioning.
The emphasis is on retrofit cooling, practical solutions that can help already-built homes stay cooler in extreme temperatures.
Several ideas emerging from the programme combine traditional Indian materials with modern sustainable design. These include terracotta-based cooling walls, solar-powered ventilation systems, and biodegradable insulation panels made from agricultural waste and mycelium, the root-like structure of mushrooms.
One IIT Delhi team developed “Terracool,” a terracotta wall cooling system that reportedly reduced indoor temperatures by up to 7°C while also lowering humidity levels. Another Bengaluru-based team created “MushCool,” insulation panels built using sugarcane bagasse and mushroom spores as an eco-friendly alternative to synthetic materials.
Together, these experiments are pushing a larger conversation into the mainstream: India’s cooling future may not depend on building stronger air-conditioners alone.
Instead, it may require redesigning homes, workplaces, and cities to work with heat more intelligently.
As climate pressures intensify, these startups are showing that cooling innovation is no longer just about comfort. In a rapidly warming world, it is increasingly becoming a question of survival, public health, and sustainable urban living.
