Increase Ducted Air Conditioner Efficiency with Whirlybirds

When it comes to maintaining a comfortable temperature in your home, ducted air conditioning units are a popular choice among Brisbane & Gold Coast homeowners. However, many are unaware of the additional benefit that roof whirlybirds can provide to these heating and cooling systems.

These simple, yet effective, roof ventilators can significantly enhance the efficiency of your ducted air conditioning by keeping the ceiling space where your ducted equipment is installed much cooler.

white whirlybird

How Do Whirlybirds Work?

Whirlybirds, also known as roof ventilators, are cylindrical dome-shaped vents installed on the roof of your home. They operate on the principle of air movement, creating a continuous vacuum effect that helps expel hot air trapped in your roof cavity. This allows for cooler air to be drawn into your roof space from under the tin, tiles, or from dedicated vents installed in your eave or soffit. This air movement is especially beneficial during hot days, but also has advantages in colder months by helping to reduce condensation.

The Mechanics of Air Movement

Vacuum Creation:

The spinning action of the whirlybird creates a vacuum that sucks out hot air.

Cool Air Intake:

Fresh, cool air is drawn into the roof space from under your tin sheets or roof tiles, replacing the trapped hot air in the ceiling cavity.

Temperature Regulation:

The constant air movement helps reduce the temperature in the roof space.

The Importance of Adequate Roof Ventilation

“Our team has been working in Brisbane and Gold Coast roofs for years, and we can vouch for the significant difference that installing a couple of whirlybirds can make. Not only do they make the roof space more bearable for us to work in, but they also contribute to a more efficient air conditioning system for your home.”

— Phill Crawley, Co-Founder Smarter Air & Electrical

Problems Due to Inadequate Ventilation

Mould and Mildew:

High levels of moisture can lead to mould and mildew.

Inefficient Heating and Cooling:

Poor ventilation can make your heating and cooling systems work harder, increasing your energy bills.

Structural Damage:

Trapped moisture can degrade insulation and even cause structural damage over time.

Improved Airflow and Lower Temperatures

One of the primary benefits of installing whirlybirds is the increased airflow movement and reduced temperatures in your roof space. The spinning action of these roof ventilators generates a vacuum, effectively pulling in cool air from the outside and expelling hot air.

This improved airflow is particularly beneficial if you have ducted air conditioning, as most of its components are located in the roof cavity. By maintaining a cooler ceiling space, your air conditioning units operate more efficiently, reducing your electricity consumption and ultimately lowering your running costs.

Combatting Humidity with Whirlybirds

Whirlybirds serve another crucial function: they are highly effective in reducing humidity in your roof space. In many Australian homes, bathroom exhaust fans vent moist air directly into the roof. Without adequate ventilation, this moisture-laden air becomes trapped, creating an ideal environment for mould, mildew, and pests.

High humidity in the roof space is a common issue in Brisbane, leading to mould growth that is not only costly to remove but also poses health risks due to allergens and irritants. Installing a roof whirlybird helps circulate the air, replacing damp, stagnant conditions with fresh, dry air from outside. This can prevent a range of issues, from mould and mildew to more severe problems like insulation degradation and structural damage.

2 whirlybirds on the roof

Why Reducing Humidity Matters

Health risks:

Mould and mildew can produce allergens that are harmful to health.

Structural Integrity:

Excessive moisture can weaken the structural integrity of your home.

Pest Control:

Dry conditions are less inviting for pests like insects and rodents.

Energy and Cost Savings

Whirlybirds are a cost-effective solution for helping to reduce your air conditioning system’s running costs. Improved airflow and reduced humidity in the roof space mean that your air conditioner doesn’t have to work as hard, resulting in lower energy bills. While the exact amount of energy savings can vary, reducing your roof space’s temperature and ventilation is a proven way to make your ducted air conditioning system more energy-efficient, offering potential running cost savings over time.

How Whirlybirds Save You Money

Reduced Energy Consumption

Less work for your air conditioning system means less electricity used.

Long-Term Savings

The initial cost of installing whirlybirds is quickly offset by the long-term savings on your energy bills.

Easy and Cost-Effective Installation

Whirlybirds are not only efficient but also cost-effective and easy to install. A typical whirlybird installation by one of our professionals takes about 45 minutes per unit. While DIY installation is an option, we highly recommend professional installation to eliminate the risk of roof leaks & to ensure the job is carried out safely.

Installation Considerations



A professional installation typically takes less than an hour per unit.


The cost of the unit and installation is quickly offset by your potential energy savings.


Professional installation ensures optimal performance and reduces the risk of issues like roof leaks.

How Many Whirlybirds Do I Need?

For most average-sized Australian homes, ranging between 160-180 square meters, we recommend installing at least two roof vents. For larger homes, three or more may be necessary for adequate ventilation.

Factors to Consider When Choosing the Number of Whirlybirds

Home size:

Larger homes may require more units for effective ventilation.


Homes in hotter climates may benefit from additional units.

Roof type:

The type & colour of your roof can also influence the number of whirlybirds you’ll need.

Our Recommended Brand

We use and recommend Ampelite Spinaway turbo ventilators. These are made from durable aluminium, feature a free-flow 300mm throat for maximum airflow, and have a sealed dual bearing housing for long life and silent operation. Plus, they come with a 10-year manufacturer’s warranty.

Why We Choose Ampelite


Made from high-quality materials that withstand the elements.


Designed for maximum airflow.


Comes with a 10-year manufacturer’s warranty for peace of mind.

A Colour for Every Home

Whirlybirds are not just functional; they can also be a stylish addition to your home. They come in a wide range of standard colours to complement any exterior design. Whether you’re looking for something subtle like ‘Shale Grey’ or ‘Surfmist,’ or something more vibrant like ‘Deep Ocean’ or ‘Manor Red,’ you’re sure to find a colour that suits your taste & closely matches your existing roof colour.

Available Colours

available colors

Next Steps

Ready to maximize the efficiency of your ducted air conditioning system?

Ask our team about adding a whirlybird to your ducted air conditioning package today!

Our Coverage

Our air conditioning service also includes new housing estates at North Lakes, Caboolture, North Brisbane, Redland Bay, Ipswich, Shoreline Estate, Pimpama, Flagstone, Bethania, Brookhaven, Holmview, Bahrs Scrub, Mount Cotton, Victoria Point, Thornlands, Woongoolba, Highfields, Kingsholme, Ormeau, Rochedale, Everleigh Estate, Springfield Lakes, Skyridge Estate - Worongary, Forest Lake, New Beith, Pallara, Logan Reserve, Logan Village, Coomera, Jacobs Well, Maudsland, Pacific Pines, Nerang, Gilston, White Rock, Highland Park, Hope Island, Lawnton, Helensvale, Worongary, Aura Estate Bells Creek, Robina, Yarrabilba, Flagstone, Spring Mountain & Greenbank.

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Contact Us

Get in touch with the Smarter Air & Electrical team today!

We are your ducted air conditioning installation specialists servicing Brisbane South, Redlands, Logan, Gold Coast & Ipswich.

Opening Hours



Unit 19/55-57 Commerce Cct, Yatala QLD 4207

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