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Environment
Jun 01, 2026
Analyzed by GPT OSS 120B

Cool Roof Paint Cuts Indoor Heat and Boosts Sleep in South African Townships

AI Summary
A study of 240 African homes finds that reflective roof paint reduces indoor temperatures by 3‑4°C, improving sleep and health for residents like Sylvia in Cape Town's Khayelitsha township. The pilot, part of the Wellcome Trust‑funded HeatNexus programme, aims to scale the intervention to millions of vulnerable households.

Cool Roof Paint Lowers Indoor Temperatures Across African Households

Reflective roof paint applied to asbestos roofs in Khayelitsha, a township on the outskirts of Cape Town, has made summer evenings noticeably cooler, allowing residents to sleep better and stay indoors during scorching days.

Study Shows 3‑4°C Temperature Drop in Painted Roofs

Temperature data collected over three summers from 240 houses across Africa reveal a consistent cooling effect in homes with painted roofs.

  • 240 houses monitored in total
  • 30 painted roofs and 30 unpainted controls in Khayelitsha
  • Average indoor temperature reduction of 3‑4°C during the hottest time of day
  • In 2024, South Africa experienced 13 heatwave days (80% attributed to climate change)

Health Benefits Linked to Cooler Homes

Researchers Lara Dugas (epidemiologist) and Mark New (climate scientist) report that the cooler indoor environment improves sleep quality, which in turn mitigates mental‑health risks and reduces the severity of conditions such as hypertension, diabetes and cardiovascular disease.

Implications for Climate‑Adaptation Policy in Low‑Income Communities

The pilot, called Habvia, is one of nine projects under the Wellcome Trust‑funded HeatNexus programme. It demonstrates that locally manufactured, infrared‑reflective paint (Rhinoluxe Heat Reflect) can be a cost‑effective adaptation tool where existing solutions are lacking. Scaling the approach could address heat‑related health inequities in both urban and rural settings across Africa.

Future Outlook: Scaling Up Cool‑Roof Interventions

The research team aims to “paint millions of roofs,” emphasizing price, local supply chains and community engagement as critical factors for broader rollout. Continued monitoring will assess long‑term health outcomes and inform policy recommendations for heat‑resilient housing in low‑ and middle‑income regions.