Whirly bird is a great addition to one’s home. It’s a cylindrical dome that is produced either in aluminium mill finish or colorbond. They come in varying sizes with the most common sizes being 200 mm and 300 mm. Standard home use is recommended to a 300mm size whirlybird. They are widely used among homes and the most common one being the non-mechanical wind driven whirlybird.
But do they really work? Absolutely yes. Whirlybird helps to regulate the roof temperature. It helps drive off hot air trapped inside the roof. Imagine a balloon with lot of air trapped inside. What happens if you pierce a needle? However, one must note that adequate vents must also be installed in the ceiling for proper air displacement. A house with 1-2 bedrooms would need 2 whirlybirds, for a 3 bedroom up to 4, and for a 4 bedroom, up to 5. The general rule of thumb is 1 whirlybird per room (for wind driven whirly bird).
Solar whirlybird (commonly referred to as sola tube) has a very different set up. It is 15 times more effective than wind driven whirlybird and uses solar energy to drive wind energy that in turns helps regulate the home temperature. Solar driven whirlybirds costs more than standard wind driven whirly bird and is more effective. A typical sola tube covers around 80m2 living space.
So how much would each of them cost? The beauty of modern world is you have plenty of product choice in the market. However, installing it correctly is an art and should not be compromised. Installers can charge you anywhere from $100 – $500 for a wind driven whirlybird depending on size (200 mm or 300 mm), type of roof and location of the task. A double story house will also affect the pricing. A sola tube on the other hand will cost you anywhere from $800 – $ 1500 depending on the type of roof, location of the job.
The Chart below helps us to understand why sola tube is better than wind driven whirlybird (chart courtesy of Roof Ventilation Blog)
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