Don't set your thermostat at a colder setting than normal when you turn on your air conditioner. It will not cool your home any faster and could result in excessive cooling and, therefore, unnecessary expense.
If your refrigerator is more than 10 years old, consider replacing it. New refrigerators today use half the energy of 10-year-old refrigerators and Energy Star labeled refrigerators are even more efficient. Some use 15% less energy than required by federal guidelines.