Science & Tech · Science & Environment · 3 hrs ago
Passive cooling could reduce Colombo homes’ reliance on fans and air conditioners
As temperatures rise in Colombo, many residents rely on fans and air conditioners to keep their homes cool.
Sri Lanka’s urban residential sector uses nearly a third of the country’s energy, including for heating and cooling buildings.
Passive cooling uses natural conditions such as wind and shade to lower indoor temperatures without relying as much on mechanical cooling.
Engineers say natural ventilation, including cross-ventilation, can work well in Sri Lanka’s humid climate.
But residents in crowded areas may struggle to benefit when nearby buildings block wind, or when dust and unpleasant smells make it hard to keep windows open.
Building orientation and design can affect how much sunlight and airflow reach a home.
Sri Lanka is exploring traditional and modern passive-cooling approaches, especially for homes, as heat and energy demand increase.
Passive cooling uses natural flows such as wind and shade to lower indoor temperatures in buildings.
Researchers and architects say natural ventilation, including cross ventilation, can help cool homes in Sri Lanka’s humid climate.
Residents in cramped Colombo homes may rely on fans and air conditioners when heat, blocked airflow, dust or odors make open windows difficult.
Sri Lanka’s urban residential sector uses nearly a third of the country’s total energy demand for buildings, lighting, devices and appliances.
Sri Lanka is exploring traditional and modern passive-cooling methods, mainly for residential buildings.
- Who
- Sri Lankan residents, engineers and architects are central to the story.
- What
- Passive-cooling strategies, especially natural ventilation, could reduce reliance on fans and air conditioners.
- When
- The article was published on October 12, 2026; it also cites research from 2021.
- Where
- Colombo, Sri Lanka, and the wider country.
- Why
- Heat and rising energy demand are prompting interest in cooling methods that use natural energy flows.
This story does not have two clearly opposing sides.
Fresh air is a luxury for us because we can’t keep windows open for too long. By noon the heat becomes unbearable. If I keep the windows open till evening, there’ll be a lot of dust inside the house.
For a humid climate like ours, natural ventilation is the most important passive-cooling method. Cross ventilation is one of the techniques that doesn’t require too much energy when compared to conventional air-conditioning.
For example, when there is no big façade facing the eastern and western directions, less heat enters the house. It varies depending on the land where it is being built.
Research by Sri Lankan engineers highlighted natural ventilation as an effective passive-cooling strategy for sustainable building design.
Mongabay reported that Sri Lanka was exploring traditional and modern passive-cooling methods, mainly for homes.
- Urban residential energy use
- Nearly a third of Sri Lanka’s total energy demand
- Research year
- 2021
- Resident’s home
- Fourth floor of a 14-story apartment block in Dematagoda, Colombo
- Cooling methods
- Natural ventilation, wind and shade
- Published
- October 12, 2026
Sources
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