Open windows in the evening to let cool night air cool your house in summer
Any month you use your air conditioner, it could be adding $40 to your electricity bill.
As soon as it is cooler outside than in, open the windows in your house. If your house is two story, open windows upstairs and down to maximize air flow. You may want to put a fan in a window to help move the cooler air through your house. In the morning, when it’s warmer outside than in, close the windows.