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Something that is surprisingly effective is a whole house fan. It is a large fan that pulls air into the house(have to open windows) and blows it into the attic, forcing the VERY hot air in the attic out the roof vents. Drops the attic temps an amazing amount, say from 140*F to 65*F. Last summer at my parent's house, there were days their A/C did not come on in their well shaded home until 5 in the evening, even in triple digit heat.
In the Sacramento area, we have something called the "Delta Breeze". In the evenings, the land radiates heat and warms the air above it up, causing it to rise. Pressure falls over land, pulling cool air in along the waterways of the Sacramento River Delta. Makes the temps drop pretty dramatically in the evenings, making such a fan very effective here.
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