Another way to do this is to have a fan (or fans) exhausting air out of the attic, and close all the windows in the house except one in the basement; and this will slowly pull cool air up through the house during the day.
Close the shades and/or curtains especially on the south and west side of the house (or north and west if you live down under!) to limit the heat build up from the sun.
And yes attic and wall insulation help a great deal, too.
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