Hong Kong (CNN) — On a sweltering summer afternoon in Hong Kong, Yeung Fong-yan’s flat felt like an oven. Her air conditioner ran at full blast, but the tiny, tin-roofed room still baked in the heat, with a thermometer inside reading 36°C (96.8°F).

“Sometimes it’s so hot we can’t even sleep,” Yeung said, seated on the small bed that doubles as her couch, dining table and sleeping quarters. Her 13-year-old grandson had just returned home from school, exhausted and drenched in sweat after climbing nine floors to reach their apartment.

The two live together in a rooftop structure, on an elevator-less building in the crowded district of Sham Shui Po. Like many low-income families in the neighborhood, they’ve been pushed into makeshift housing by soaring rents and a chronic shortage of publi

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