do whirlybirds work?

Do Whirlybirds Work?

Do whirlybirds work and are they worth installing in your home?

Whirlybirds, otherwise known as roof ventilators or turbine ventilators, are installed on a roof to improve ventilation and reduce heat build-up – but are they really worth the money? Two of the most common questions that we receive around whirlybirds are when should you install them and are they worth the cost.

A very common addition to many Sydney households, whirlybirds are just one of the many ventilation systems available. Whirlybirds do not use any electricity and have been used in Australian homes for years. With so many ventilation systems out there, it’s important to choose one that is going to improve the air quality of your property and reduce reliance on air conditioning and heating devices. The big question is: do whirlybirds work?

This article will break down the basics of roof whirlybirds, how many whirlybirds do I need, and whether or not roof whirlybirds actually work.


Whirlybirds are cylindrical domes that sit on the roof of a building and spin in the wind, creating a vacuum which extracts warm air from the ceiling cavity. When the sun beats down on the roof, it heats the ceiling and roof cavity up to excessive temperatures. As a result, the heat infiltrates the interiors, making the living spaces uncomfortable and stuffy. To compensate for this compensated heat, whirlybirds offer an electricity-free roof ventilator to manage roof space temperatures.

what are whirybirds

Whirlybirds are designed to extract hot and damp air from roofing spaces, dramatically improving temperatures and increasing the comfort of a property. By removing damp and humid air within a roof void, you eliminate any potential mould or bacteria problems. In summer, whirlybirds minimise excessive temperatures, keeping the spaces nice and cool. During winter, whirlybirds work to remove excess humidity and dampness, preventing mould and bacteria growth.

Installing a whirlybird is an inexpensive way to make your home more energy-efficient, ventilated, and free from odours and stale air. Relying on whirlybirds means less dependence on air conditioning and heating devices. Whirlybirds use no electricity and can spin for more than 20 years when well-maintained; keeping your property comfortable and clean.


The answer to the question “do whirlybirds work?” is yes. Whirlybirds work to remove hot air from roof voids, effectively ventilating the room or space below. However, whirlybirds are relatively dependant on airflow to function properly. The reason there is varying information on “do whirlybirds actually work?” around is that in areas in which there is little wind, whirlybirds will not function as effectively as they will in high-wind locations.

The roof of a building or house acts as a heat trap. Whirlybirds work to effectively remove the heat that builds up in rooms, by sucking out the hot air. This helps to keep houses and properties ventilated, clean, and prevent the accumulation of hot air. In the hot Australian climate, whirlybirds can do wonders in keeping a space cool during summer.


benefits of installing a whirlybird in your home
  • Remove excess heat
  • Helps to minimise mould and dampness
  • Improves air quality and removes odours
  • Cheap to install and free to run
  • Saves on air conditioning and heating costs
  • Available in Colorbond colours to suit your roof style


If you’re considering installing roof whirlybirds, you’re probably wondering “how many whirlybirds do I need?”. This is a pretty common question. Whirlybirds work very well and will only increase the ventilation in a house when multiple are installed. The size of your house should determine the number of whirlybirds you install. Here’s a rough guide:


Tile roofing is another popular choice for property owners in Sydney, primarily due to the classic appearance, durability, and energy efficiency. The most common tiling materials used throughout Australia are concrete and terracotta. 

how many whirlybirds do I need?
  • 1-2 Bedroom Home: 2 Roof Whirlybird Units
  • 3-4 Bedroom Home: 3-4 Roof whirlybird Units
  • 4-5 Bedroom Home: 4 Roof Whirlybird Units


At Vertec Roofing, we pride ourselves on our commitment to quality. While still offering our services at reasonable rates, we only use the best quality roof whirlybirds. We complete whirlybird installation Sydney on both metal and tile roofs to ensure that your property is kept safe from damp and humid roofing issues.

If you’d like to learn more about what whirlybird installation can do for you, get in touch with one of our experts today. Our roofing contractors are experienced, knowledgeable, and offer professional advice on your roofing project with a no-obligation quote.

5 Responses

  1. Just a thought but if heat rises, just the fact that there is a hole in your roof would allow heat to escape right? Whether it’s spinning or not?

  2. Great post! Whirlybirds have been a popular choice for ventilation in Australian homes for years, and it’s interesting to explore their effectiveness. Improving air quality and reducing reliance on air conditioning and heating devices are important factors to consider. I believe it would be beneficial to delve deeper into the mechanics of whirlybirds and how they compare to other ventilation systems. Have you personally installed Whirlybirds in your home? What has been your experience with them?

  3. The efficiency and advantages of whirlybird roof vents are probably discussed in the blog post on Vertec Roofing. It’s possible that the author will describe how whirlybirds help with roof ventilation and heat dissipation. This guide explains how whirlybird vents work so that your roof can breathe better.

  4. I’ve heard mixed opinions on the effectiveness of whirlybirds, so this article caught my attention. The explanation of how they work, along with the pros and cons, is really helpful. It’s reassuring to know that proper installation and maintenance play a key role in their performance. I’m considering adding a whirlybird to my roof now, thanks to the insights here.

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