West Sydney sits well inland, and without the harbour’s cooling sea breezes it runs noticeably hotter than the eastern suburbs. Through summer, temperatures regularly climb past 40°C during heatwaves, turning roof cavities into intense heat traps. That trapped air radiates down into the rooms below, pushing air conditioners to their limit and driving up energy bills across the long, baking Western Sydney summer.

The large freestanding homes and dark roofs common across the west make the problem worse, soaking up sun through the day and holding heat well into the evening. Without active airflow, roof cavities stay hot long after sunset, and trapped moisture in the cooler months adds the risk of condensation and mould. Passive vents simply can’t shift enough air to keep up on the hottest still days.

WhirlyPro is built for exactly these conditions. Using high-efficiency solar power and an integrated smart thermostat, the system extracts over 700m³ of hot air every hour. This active extraction keeps the home’s temperature more stable, protects the roof structure, and runs entirely on renewable energy with zero ongoing costs.