This issue was addressed in the latest issue of our electric coop news letter. It suggested opening windows on upwind side of house wider than downwind side to create more air flow while ac is off. With ac on open slightly the attic access door or a window at the highest level of the house. They also said that the way you open the blinds makes a difference. In summer tilt the blind slats up toward the outside. this helps keep heat from the window from moving into the room. In winter reverse direction to help keep cold out of the room. I will try these ideas this summer and see if it helps.