Most heat-generating devices--such as laptops, cars and vacuum cleaners, rely on a flow of air to keep cool by expelling heat and drawing in fresh air.

Whirlybirds do the same for your home, expelling heat during summer, moisture during winter, and creating a slight low air pressure allowing fresh air to be drawn in from outside.

Here are the basics for what whirlybirds too and how they work:

  • Expels heat trapped in your roof.
    Hot air rises and gets trapped inside the roof cavity, covering the home or building with a heat 'blanket'. Instead of displacing hot air (like internal fans tend to) whirlybirds expel this air from the building.
     
  • Hot air is sucked out.
    Of course, whirlybirds also spin as wind passes them. This sucks out the air much quicker and creates a low pressure inside causing cooler air to be drafted in through open windows. With high quality bearings and parts (such as those used by Giant Vents) even the slightest amount of wind or pressure will drive the mechanism. Even when you can't feel any wind the Whirlybird won't stop spinning!
     
  • Creates a flow of air through the building.
    Ventilation through the roof creates a flow of air through the building, regulating temperature in all climate conditions.
     
  • Draws in fresh air from outside.
    Since air is being sucked out through the roof, this creates a slight vacuum drawing in fresh air through open windows or screen doors.
     
  • Removes moisture and condensation.
    Especially in winter, moisture and condensation can build up in your ceiling, which may affect the building structure and cause mold to grow.