What is 'AC nation' Singapore's hack to stay cool amid heatwaves?

Singapore, popularly known as 'AC nation', is hot and humid yet can stay cool amid soaring temperatures. The government promotes efficient use of ACs at 25°C or higher, along with fans to complement cooling. Cool-coating materials and reflective paints on buildings to reflect heat are also promoted. Moreover, city's planning and spacing are optimised to improve wind flow and ventilation.