South Sydney’s dense inner-city mix of terraces, warehouses, and newer apartments sits under strong summer sun and high humidity. Through the warmer months, temperatures sit in the mid-20s and spike well above 35°C during heatwaves, turning roof cavities into heat traps. That trapped air radiates down into the rooms below, loading up air conditioners and pushing energy bills higher across the long Sydney summer.

Humidity is the second issue. Sydney’s damp summers and wetter winters create ideal conditions for condensation inside the roof, and without active airflow that moisture lingers — encouraging mould growth and gradually damaging roof timbers and insulation. This is a particular concern in South Sydney’s older terraces and converted warehouses, where roof spaces are often tight and poorly ventilated.

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