Hong Kong’s subdivided flats are turning into heat traps. But what’s the fix?

Retiree Yang Fangxin’s 72 sq ft rooftop home, located on the ninth floor of a 62-year-old building in Sham Shui Po, has become a heat trap under Hong Kong’s scorching hot weather.
The temperature in her home was above 40 degrees Celsius (104 Fahrenheit) at around 5pm on Tuesday, higher than the 33 degrees recorded at the Hong Kong Observatory’s monitoring station in the same district.
The temperature in her home only dropped slightly to 37.8 degrees after switching on two fans and an air…