Key takeaways
- Positive pressure systems introduce filtered air and encourage stale air to escape through natural gaps.
- Balanced ventilation supplies fresh air and extracts stale air at the same time.
- The right choice depends on the home age, airtightness, insulation, roof space, moisture issues and budget.
Not all home ventilation systems work the same way. Two of the most common options are positive pressure ventilation and balanced ventilation. Each has advantages, and the right choice depends on your home, budget and expectations.
A site assessment is usually the best way to match the ventilation approach to the home.
What Is Positive Pressure Ventilation?
Positive pressure systems draw air from the roof space or outside, filter it and gently introduce it into the home.
The incoming air creates slight positive pressure, encouraging stale, moisture-laden air to escape through natural gaps and openings.
What Is Balanced Ventilation?
Balanced ventilation systems both supply fresh air and extract stale air at the same time.
Many include a heat recovery unit that transfers warmth from outgoing air to incoming fresh air, helping maintain comfort during winter.
Which Is Better?
Neither system is automatically better.
A suitable solution depends on:
- The age of your home.
- Insulation levels.
- Airtightness.
- Roof space.
- Moisture issues.
- Budget.
A site assessment usually provides the best answer.
What Problems Can They Help?
Both systems can help reduce:
- Window condensation.
- Stale indoor air.
- Excess indoor humidity.
- Mould caused by everyday moisture.
They work best alongside good insulation and sensible heating.
When Should You Contact Holmes Services?
If you are considering installing a ventilation system, professional advice helps ensure the system is matched to your home construction and your family needs.
Frequently asked questions
Is balanced ventilation more efficient?
In many homes it offers greater control, particularly when fitted with heat recovery, but it also costs more to install.
Is positive pressure suitable for older homes?
Yes. Many older Auckland homes are well suited to positive pressure systems.
Can ventilation replace insulation?
No. Ventilation and insulation perform different jobs and work best together.
Need practical advice for your home?
Holmes Services helps Auckland homeowners and businesses with heat pumps, ventilation, refrigeration and indoor comfort issues.