Mythbuster: Keeping the windows open to create a breeze when it’s hot outside does NOT cool the house.
Mythbuster: Room fans do not make the air temperature lower. Ventilation fans (attic or whole house fans) DO cool the house, but only when it is cooler outside than inside.
Mythbuster: It does NOT use more electricity to turn electronics off and on again.
Mythbuster: It does NOT use more electricity to turn the A/C off and on again.