Key Differences Between Passive Solar Design & Passive House

At first glance, passive solar and Passive House sound similar – and they are both powerful approaches to low-energy living. But there are important differences.

1. Airtightness

• Passive Solar: May or may not be airtight; relies mostly on natural ventilation.

• Passive House: Airtightness is tested and certified; ventilation is mechanical and controlled.

2. Ventilation

• Passive Solar: Fresh air depends on opening windows and breezes.

• Passive House: Balanced ventilation with heat recovery delivers fresh filtered air 24/7.

3. Predictability

• Passive Solar: Comfort depends on design, construction, and user behaviour.

• Passive House: Performance can be modelled and guaranteed before the home is built.

4. Windows

• Passive Solar: Typical Australian windows often perform poorly.

• Passive House: Requires high-performance windows, dramatically reducing heat loss/gain.

Which One Is Best for You?

• If you love engaging with the seasons and don’t mind a little variation in comfort → Passive Solar may suit you.

• If you want precise control, healthier air, and consistently stable comfort → Passive House is worth the investment.

At Natural Matters Design, we’ve created both – and the right solution depends on your lifestyle, site, and goals.