How does ventilating my attic reduce air conditioning costs?

How does ventilating my attic reduce air conditioning costs?

Dan Sharp (Green Family Expert) gives expert video advice on: Does my air conditioner contribute to 'carbon emissions'?; What can I do to the outside of my windows to make them more energy efficient? and more...

In the heat of summer your attic is extremely hot, and ventilating the attic allows air to move through the attic which cools it and basically reduces the effect of the heat transfer from the attic into the house.