Energy experts say you spend about 25-cents an hour using your air conditioner. The costs go up about ten cents more an hour if you leave the AC on ALL day. Sierra Pacific also recommends
Set the controls on your air conditioner between 78 and 80 degrees when at home; 5 to 10 degrees warmer at night or when you're not home.
If your air conditioning unit is located on the ground, keep the area around it clean and free of obstructions to maintain airflow. Keep the outdoor condenser coils clean and be sure to change your air conditioning filters.
Turn off lights and appliances when they're not in use, including your computer.
Close blinds and drapes during the day to keep the heat out.
Use your dishwasher, washing machine and dryer as late in the evening as possible. Run full loads. Also, use the energy saver feature on your dishwasher, which allows dishes to air dry. When they're on, appliances generate heat. So turning them off may save air conditioning energy.
Instead of using the stovetop or oven to prepare meals, barbecue outside. By reducing the heat produced in your home by the stove, you will reduce the load on your air conditioner.