How We Went From Hand Fans to Smart ACs: A Journey Through Cooling History

India's scorching summers have always tested human endurance and our ability to find new ways to beat the heat. For centuries, people have come up with different ways to cope with the blazing sun and humidity, and many of these methods are deeply connected to our lifestyle, culture and architecture. If we go back a few decades, hand-operated fans, known as bijan or hand fans, were an essential part of almost every household. Made from palm leaves, cloth or thin strips of bamboo, these fans were more than just a way to create a breeze. They were also part of everyday family life. People would sit together in courtyards, fan one another, and grandparents would gently fan children to help them fall asleep. These small moments were woven into our daily routines and family bonds. But as time passed and science and technology advanced, the way we kept ourselves cool began to change. What started with hand fans gradually moved to table fans, ceiling fans and traditional desert coolers made with grass or other natural materials, eventually leading to today's smart air conditioners powered by artificial intelligence. This is not just the story of how one device replaced another. It is also the story of how our homes, lifestyles, social relationships and everyday habits have changed.

A look at history and traditional Indian architecture reveals that our ancestors had developed remarkable ways to keep their homes cool without electricity. Many old houses were designed around the principles of passive cooling. Thick walls made from materials such as mud and lime helped reduce the transfer of heat from outside. High ceilings allowed warm air to rise, while ventilators helped it escape. Open courtyards encouraged natural airflow and made the house more comfortable. In Rajasthan, traditional lattice windows and jharokhas were not merely decorative features; their design helped regulate airflow and provide shade. In the palaces of the Mughals and Indian royalty, khas grass screens were often soaked with water. When air passed through them, evaporation helped cool the surroundings while releasing a distinctive earthy fragrance. Large cloth fans, known as pulling fans, were suspended from ceilings and operated by pulling ropes.

In 1902, American engineer Willis Carrier developed an early modern air-conditioning system, initially designed to control humidity in a printing plant rather than to cool people. This invention eventually changed the way people lived and worked in hot climates. As air conditioning became more widely available, it became easier to maintain comfortable indoor temperatures regardless of the weather outside. In India, as electricity access expanded during the 1980s and 1990s, household cooling options also began to change. Air coolers became a familiar aspiration for many middle-class families. The smell of damp grass and the gentle sound of circulating water were part of summer evenings, when family members often gathered and slept together in the coolest room of the house.

Over the past two decades, however, India's changing economy, rapid urbanisation and growing dependence on concrete buildings have transformed the way we cool our homes. Modern apartments and high-rise buildings often have little space for open courtyards, thick traditional walls or carefully designed windows that encourage natural ventilation. Concrete structures can absorb and retain heat, making indoor spaces uncomfortable and increasing the need for air conditioning. There was a time when one cooler in the living room was enough for an entire family. Today, split and smart ACs are increasingly common in individual rooms. Many modern models connect to Wi-Fi and can be switched on through a smartphone app before the user arrives home. Some use sensors to adjust cooling according to room temperature or the presence of people. Inverter and brushless DC (BLDC) technologies can also improve energy efficiency in suitable applications. As a result, air conditioning is no longer seen only as a luxury for wealthy households; for many people, it has become an important part of everyday life. Research by organisations such as the Council on Energy, Environment and Water (CEEW) has highlighted the growing demand for cooling in India. This rising demand reflects how quickly our homes, lifestyles and dependence on technology are changing.

These developments have had a significant social, economic and psychological impact. One of the biggest changes can be seen in how people spend their evenings and interact with one another. In the past, when air conditioners were uncommon and homes were designed to allow more natural airflow, families would sprinkle water on their rooftops to cool them down. At night, people often slept on terraces or laid out charpais in the streets. They talked late into the night, shared stories and stayed connected with their neighbours. As air conditioning became more common and homes increasingly relied on enclosed, glass-windowed rooms, people began keeping their doors and windows shut and spending more time in separate indoor spaces. This brought greater personal comfort, but it also reduced some of the everyday interaction that once came naturally with community life.

Our relationship with heat has changed, too. People who spend most of their day in air-conditioned offices, cabs, shopping malls and bedrooms may become less accustomed to high temperatures. For some, even moderate heat can feel uncomfortable after hours in a cool environment. This does not mean that air conditioning automatically makes people less tolerant of heat, but it does show how our surroundings influence what we consider comfortable. The more we rely on artificial cooling, the less often we may experience the natural changes in temperature that were once part of daily life.

For young Indians, this shift has both advantages and disadvantages. People working from home or in the IT sector often benefit from a comfortable indoor environment. Excessive heat can cause fatigue, make concentration more difficult and affect productivity. Air conditioning helps maintain more stable working conditions, supporting activities such as studying, research and office work. It is also essential in many hospitals, laboratories and workplaces where temperature control matters. At the same time, spending more time indoors can mean fewer opportunities for physical activity, particularly when children and young adults choose video games or screen time over outdoor play. Reduced outdoor activity may contribute to health concerns such as weight gain, while limited sunlight exposure can increase the risk of vitamin D deficiency. Air-conditioned environments can also worsen dry eyes or skin dryness for some people, especially when humidity is low.

Like any other technology, smart cooling has its benefits and drawbacks. Air conditioners provide relief from extreme heat and can make it easier to sleep, work and recover in hot weather. They can also filter certain airborne particles when equipped with appropriate filters and properly maintained, although they do not automatically protect against every form of pollution. Beyond homes and offices, air conditioning is essential for maintaining safe conditions in many hospitals, data centres and industrial facilities. Without reliable cooling, some medical equipment, digital infrastructure and manufacturing processes could be disrupted.

However, the environmental costs are becoming increasingly difficult to ignore. Air conditioners release heat outdoors, which can contribute to higher temperatures in densely built-up areas. This effect is associated with the urban heat island phenomenon, in which cities become warmer than surrounding rural areas. Air conditioning also requires electricity, and when that electricity comes from fossil fuels, it contributes to greenhouse gas emissions. Some refrigerants used in cooling systems are themselves powerful greenhouse gases if they leak into the atmosphere. As temperatures rise and more households install ACs, the demand for electricity and cooling equipment can create a cycle that puts further pressure on the environment. Poorly maintained or excessively cold indoor environments may also contribute to discomfort, dry skin and eye irritation, while people with certain respiratory conditions may be sensitive to changes in indoor air quality.

The journey from hand fans and traditional, naturally ventilated homes to smart air conditioners is therefore about much more than convenience. It reflects humanity's desire to make life more comfortable and overcome the limitations imposed by nature. Hand fans and traditional architecture kept us closely connected to our surroundings and often brought families together, while smart ACs offer instant comfort but can encourage a more enclosed and energy-dependent lifestyle.

Rejecting modern technology is neither practical nor necessary, especially as heatwaves become a growing concern. The real challenge is to use technology wisely without becoming completely dependent on it. We need to combine the knowledge of traditional Indian architecture with modern cooling solutions. Better building design, shaded windows, natural ventilation where suitable, energy-efficient appliances, solar power and greener cooling technologies can all help reduce the environmental cost of staying comfortable. The goal should not simply be to cool our homes, but to do so responsibly. After all, there is little sense in protecting ourselves from the heat by continuously making the planet we all depend on even warmer.