Positive Pressure vs Balanced Ventilation (NZ Guide)
4-minute read • Updated April 2025
Choosing the right ventilation system is essential for improving indoor air quality and reducing condensation in New Zealand homes.
What is positive pressure ventilation?
Positive pressure systems push air into the home, typically from roof spaces, forcing stale air out through gaps and openings.
Pros
- Lower installation cost
- Simple design
- Works in older homes
Limitations
- Relies on roof cavity conditions
- Variable performance
- Limited airflow control
What is balanced ventilation?
Balanced systems bring fresh air in and remove stale air out simultaneously, often using heat recovery.
Pros
- Consistent airflow
- Independent of roof space
- Better suited to modern homes
Limitations
- Higher cost
- More complex installation
Which system is best?
The best system depends on your home type, insulation, and moisture levels.
👉 Learn more about condensation: How to Stop Condensation
Common mistakes when choosing a ventilation system
- Choosing based on price instead of performance
- Not considering insulation and airtightness
- Relying on roof cavity air without understanding conditions
- Not addressing moisture at source
Avoiding these pitfalls ensures your system delivers lasting comfort and air quality.