Ventilate when it's cool outside. Most areas of California have cool, dry nights even after the hottest days. Cut your cooling costs by opening windows when it's cooler outside than inside. In the morning, close up the house to trap the coolness inside. Use ceiling fans wisely.
Ceiling fans create enough air movement in a room to make it feel cooler by four degrees or more.
They use only about as much energy as a 100-watt light bulb. Since you will feel cooler, make sure that you turn up your thermostat to 80 degrees or higher to save on your energy costs. Eliminate wasted energy. Turn off lights in unoccupied rooms. Remove the refrigerator door for safety reasons and to prevent mold.