Building for a Hotter Future: Smart Design Solutions to Cut Building Energy Use, Particularly in the Global South

Buildings in hot climate zones face unique challenges in reducing energy use and CO₂ emissions, especially as urbanization and population growth drive new construction. This study examines how different design choices and technologies can help make buildings more energy-efficient while keeping them comfortable in high temperatures. Using computer simulations, the researchers tested five building types—ranging from homes to offices—across five hot climate regions. They explored a mix of passive design strategies (like better windows, reflective roofs, and solar shading), active cooling systems, and renewable energy options to see which solutions had the greatest impact.

The results show that simple changes, such as improving windows and adding shading, can significantly reduce cooling needs. More advanced systems, like hybrid ventilation and decentralized cooling units, further improve efficiency, while solar energy solutions help offset electricity use. The study also found that climate change will increase cooling demand in the future, making energy-efficient design even more critical. Notably, residential buildings had the greatest potential for achieving low-carbon or even zero-carbon status, while offices and hotels posed greater challenges due to their higher energy use.

To turn these insights into action, the study highlights the need for stronger policies and building codes, particularly in the Global South, where energy-efficient design is less widely implemented. The findings provide a roadmap for decision-makers to develop strategies that balance affordability with sustainability. By combining modern technology with lessons from traditional architecture, buildings in hot climates can become more efficient, reducing emissions while improving comfort and resilience in a warming world.

Overview of building types showing floorplans and basic renderings.

Citation

Österreicher, D., & Seerig, A. (2024). Buildings in hot climate zones—Quantification of energy and CO₂ reduction potential for different architecture and building services measures. Sustainability, 16(22), 9812. https://doi.org/10.3390/su16229812

Climate Action: Indicators of Progress

Bouygues Construction has partnered with Ecocem to use its low-carbon ‘ACT’ cement, which reduces CO2 emissions by 70%. After rigorous testing at facilities in France and a full-scale mock-up, Bouygues will evaluate the cement's performance under typical site conditions. Ecocem’s ACT technology, launched in 2022, replaces 70% of traditional clinker with alternative materials, marking a significant step in construction sector decarbonization. Ecocem is expanding its production capacity, with a U.S. factory planned.

Bouygues agrees to use low-carbon cement brand after testing it

Global Construction Review

More Pollution Less Rain for the Hills

As air moves over mountains it cools which can lead to rain or snow. With polluted air this tendency is decreased by up to 50%. As to why... ?

clipped from www.sciencemag.org Particulate air pollution has been suggested as the cause of the recently observed decreasing trends of 10 to 25% in the ratio between hilly and upwind lowland precipitation, downwind of urban and industrial areas. We quantified the dependence of this ratio of the orographic-precipitation enhancement factor on the amounts of aerosols composed mostly of pollution in the free troposphere, based on measurements at Mt. Hua near Xi'an, in central China. The hilly precipitation can be decreased by 30 to 50% during hazy conditions, with visibility of less than 8 kilometers at the mountaintop. This trend shows the role of air pollution in the loss of significant water resources in hilly areas, which is a major problem in China and many other areas of the world.