No AC, no cooler: How this Delhi home stays 10°C cooler during summer

With temperatures in Delhi frequently crossing 45°C during the ongoing summer season, air conditioners have become a necessity for many households. However, a 40-year-old home in the national capital is proving that thoughtful design can sometimes achieve what machines do.

The house reportedly remains up to 10°C cooler than the outside environment without depending on air conditioners or desert coolers.

Instead, it relies on a combination of passive cooling strategies, traditional architectural principles and sustainable living practices that work with the climate rather than against it.

The central courtyard creates natural airflow

One of the most important features of the house is an open-to-sky courtyard located at its centre.

Courtyards have long been a hallmark of traditional Indian architecture, particularly in regions that experience intense heat.

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In this Delhi home, the courtyard acts as a natural ventilation system. As warm air rises and escapes through the open space, cooler air is drawn into the house through windows and strategically placed openings.

This continuous movement of air promotes cross-ventilation, helping to reduce indoor temperatures without consuming electricity. The design allows the house to remain comfortable even during the hottest hours of the day.

Heat-resistant materials help keep interiors cool

The cooling effect is not solely dependent on airflow. The building materials used throughout the house also play a significant role.

The flooring is made from Kota stone, a material widely known for its ability to remain relatively cool even in high temperatures. The house also incorporates insulated ceilings that reduce heat transfer from the roof, one of the biggest sources of indoor heat gain during summer.

Together, these elements slow the absorption of heat and help maintain a more stable indoor temperature throughout the day.

Green spaces act as a natural thermal shield

Vegetation is another key component of the home's cooling strategy.

According to reports, the property includes substantial greenery that helps create a cooler microclimate around the house. Plants and trees provide shade, reduce the amount of solar radiation reaching walls and windows, and contribute to evaporative cooling.

In many traditional and climate-responsive buildings, greenery serves as a natural barrier against excessive heat while also improving air quality and overall comfort.

Sustainable features beyond cooling

The house's environmental credentials extend well beyond temperature control.

Rainwater harvesting systems channel water into recharge pits, helping replenish groundwater reserves. Organic kitchen waste is composted and used to nourish plants, reducing the amount of waste sent to landfills.

The homeowners have also incorporated solar panels to meet a portion of their energy needs. In addition, several furnishings have been crafted from recycled wood, demonstrating a broader commitment to sustainable living.

Why passive cooling is gaining attention

As energy demand rises and heatwaves become more frequent, architects and urban planners are increasingly revisiting passive cooling principles.

Passive cooling refers to design strategies that minimise heat gain and enhance heat dissipation without mechanical cooling systems. These methods can include courtyards, shading, cross-ventilation, thermal mass, insulation and landscaping.

Research on climate-responsive architecture in Delhi has shown that ventilation, shading and thermal mass can significantly improve thermal comfort while reducing dependence on energy-intensive cooling systems.

Lessons for urban homeowners

While not every homeowner can redesign an entire house, several lessons can be drawn from this example.

Improving ventilation, using heat-resistant materials, insulating roofs, planting shade-giving vegetation and incorporating sustainable building practices can all contribute to lower indoor temperatures. Even small interventions can help reduce cooling loads and energy consumption during extreme summer conditions.

As Indian cities continue to face rising temperatures, this Delhi home's approach offers a compelling reminder that traditional architectural wisdom still has an important role to play in modern urban living.

A blueprint for climate-resilient living

The Delhi house demonstrates that effective cooling does not always require energy-intensive appliances. By combining traditional design principles with sustainable technologies, it achieves a level of comfort that many modern buildings struggle to match.

At a time when climate change is making summers hotter and longer, such examples highlight the potential of passive cooling techniques to create more resilient, environmentally responsible and energy-efficient homes.

Inputs and information sourced from: The Better India