Here are simple steps to improve air circulation in your home and save some money:

Open windows on opposite sides of the house to pick up daytime breezes and create cross-ventilation.

Vent warm air through upstairs windows (heat rises)

Draw Curtains, shades and shutters to block daytime sun.

Leave doors ajar between rooms so that air can move around.

If nights are cooler, open windows only in the evening, to let in cool air; close them in the mornings. Consider a whole house fan that can exchage all the air every one to two minutes.