Reflective roof coatings keep homes cool, cut energy bills, and combat rising temperatures during El Niño. Low‑cost heat relief for Australian households.

Even before adding solar panels, a roof can keep a home cool and lower energy bills. With an historic El Niño under way in the Pacific, Australia could face record temperatures this summer. Reflective roof coatings provide a cost‑effective way for hot homes to beat the heat.

Cooler roofs and heat mitigation

Reflective coatings work by bouncing sunlight away from the building surface. The result is a lower roof temperature, reduced air‑conditioning load, and lower electricity costs. Homeowners can choose from white paints, metallic finishes, or specialized elastomeric membranes.

El Niño raises temperature risk

El Niño conditions increase the likelihood of hotter, drier weather across southern Australia. Forecasters warn that daytime highs could exceed historical averages by several degrees. Installing a reflective roof before the peak summer period helps mitigate the impact of these extreme conditions.

Case study: Adelaide home

The upstairs bedrooms and office in Nic Jacobson’s two‑storey home in inner‑suburban Adelaide used to get unbearably hot, even when his large air‑conditioning system ran flat out. After applying a reflective coating, the interior temperature dropped noticeably, and the air‑conditioner ran less frequently. Jacobson reports lower power bills and greater comfort during the hottest days.

Cost and installation

Reflective coatings typically cost between $2 and $5 per square metre, depending on product type and application method. Professional installation ensures even coverage and optimal performance. Most coatings last ten years before re‑application is required.

• Reduces roof temperature by up to 30°C
• Cuts air‑conditioning energy use by 10‑20%
• Lowers household carbon emissions
• Improves indoor comfort during heatwaves

Got a question or tip for reducing household emissions? Email us at changebydegrees@theguardian.com.