Whirlybirds: What they do and what they cost

Whirlybird Installation

How do Whirlybirds Work?

Whirlybirds, also known as roof ventilators or turbine vents, utilise wind power to enhance airflow and ventilation. As wind blows across the device, the fins catch it and initiate rotation. This creates a low-pressure area, allowing trapped warm air and moisture to be drawn out while pulling in cooler air from outside. The continuous spinning of the Whirlybird promotes air circulation, temperature regulation, and improved indoor air quality.

Whirlybirds operate on a passive ventilation system, harnessing wind energy to facilitate air exchange without external power. Their rotation is solely powered by the wind, making them an eco-friendly and cost-effective solution. Designed to withstand various weather conditions, Whirlybirds offer sustainable airflow enhancement for comfortable living and working environments.

What’s the purpose of whirlybirds?

  • Enhance airflow and ventilation in buildings.
  • Improve indoor air quality by removing trapped warm air and moisture.
  • Reduce humidity levels inside the building.
  • Promote air circulation and prevent stagnant air.
  • Regulate temperatures by removing excess heat.
  • Provide natural and eco-friendly ventilation without requiring external power.
  • Reduce the reliance on artificial cooling systems, leading to energy savings.
  • Help prevent the buildup of mold, mildew, and condensation.
  • Extend the lifespan of the roof by reducing moisture-related damage.
  • Provide a cost-effective solution for maintaining a comfortable and healthy living or working environment.

Whirlybirds vs. Other Roof Vents

Roof Vents Advantages Disadvantages
  • Utilises wind power for ventilation.
  • Eco-friendly and energy-efficient.
  • Cost-effective solution for improving airflow.
  • Requires sufficient wind for optimal performance.
  • May not be as effective in areas with low wind.
  • Noise generated by the spinning motion can be audible.
Ridge Vents
  • Provides continuous and consistent ventilation.
  • Helps prevent moisture buildup and mold growth.
  • Works well with proper installation and sealing.
  • Proper installation is crucial for optimal performance.
  • Effectiveness can vary based on roof design and airflow dynamics.
  • May require additional roof modifications for installation.
Soffit Vents
  • Allows for fresh air intake into the attic or roof space.
  • Helps maintain a balanced airflow and prevents condensation.
  • Can be effective in combination with other roof vents.
  • Effectiveness can be dependent on the design and condition of the soffit area.
  • Requires proper positioning and installation for optimal performance.
  • May require periodic maintenance to prevent blockage.
Gable Vents
  • Assists in natural airflow through the attic.
  • Provides additional ventilation in gable walls.
  • Helps exhaust hot air and reduce temperature buildup.
  • Effectiveness can be limited if not properly positioned.
  • Can create imbalances in the overall ventilation system if not properly coordinated with other vents.
  • May require additional measures for effective sealing.
Turbine Vents
  • Utilises wind power to drive rotation.
  • Effective in high wind conditions.
  • Can provide efficient ventilation in areas with sufficient wind.
  • Noise generated by the spinning motion can be audible.
  • Can be less effective in areas with low wind or inconsistent wind patterns.
  • Requires periodic maintenance to ensure proper functioning.
Power Vents
  • Electrically powered, actively exhausts air using built-in fans or motors for enhanced ventilation.
  • Requires electricity for operation, potentially increasing energy costs.
  • Installation may require electrical connections and professional expertise.
  • Regular maintenance needed for optimal performance and longevity.
  • Ridge Vents: Installed along the roof peak, ridge vents provide continuous ventilation to balance airflow throughout the attic or roof space.
  • Soffit Vents: Placed under the eaves, soffit vents allow fresh air to enter the attic or roof space, preventing moisture buildup.
  • Gable Vents: Positioned in the gable walls, gable vents serve as outlets for hot air to escape and facilitate a natural flow of air through the attic or roof space.
  • Turbine Vents: Utilising wind power, turbine vents rotate and create a pressure difference to exhaust stale air and draw in fresh air from the attic or roof space.
  • Power Vents: Electrically powered, power vents actively exhaust air from the attic or roof space using built-in fans or motors for enhanced ventilation.

How Many Whirlybirds Do I Need?

2-3 Bedroom House


Install two Whirlybirds for effective ventilation in a 2-3 bedroom house, placing one near the front and another near the back of the roof.

3-4 Bedroom House


For a 3-4 bedroom house, install three Whirlybirds to ensure adequate ventilation, positioning them near the front, middle, and back of the roof.

4-5 Bedroom House


In a larger 4-5 bedroom house, maximise ventilation efficiency by installing four evenly distributed Whirlybirds across the roof to remove hot air and enhance airflow throughout the entire space.

Whirlybird Cooling and Rate of Airflow – Are they Effective?

Yes, Whirlybirds are effective for cooling and improving airflow in buildings. They utilise wind power to create a pressure difference, facilitating the extraction of hot air and the influx of fresh air, thus enhancing ventilation and cooling the interior space.

Does a Whirlybird need wind to work?

No, a Whirlybird does not need wind to work. While wind can enhance its performance, Whirlybirds can also rotate and create ventilation through temperature differences alone, even in the absence of wind.

Whirlybird or Solar Vent installation costs

WindMaster Whirlybird (left), Solar Roof Vent (right)

The choice between Whirlybird and solar vent depends on your preferences and needs. Whirlybirds utilise wind power, while solar vents rely on solar energy. Consider factors like location, climate, and budget when making your decision.

The cost for WindMaster whirlybird installation is approximately $495 inc. GST. The cost of a solar ventilator is approximately $990 inc. GST.

Can rain come through a Whirlybird?

Whirlybirds can withstand high winds and heavy rains. The shape of the overlapping fin means water can’t penetrate. The International rain dynamic penetration test has been applied on Edmonds products.

Improve ventilation in your home with a Whirlybird

Get a free quote for a Whirlybird installation today! Improve airflow, reduce humidity, and enhance indoor comfort. Click here to book your appointment and experience the benefits of Whirlybirds.

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