Adjust Your Refrigerator and Water Heater
Water heating is the second largest energy expense in your home, typically accounting for about 18% of your utility bill. The Department of Energy recommends setting the thermostat on your water heater to 120°F to get comfortable hot water and reduce energy expenditure.
The Department of Energy suggests setting your refrigerator to between 37°F to 40°F and the freezer to 5°F for optimum efficiency. Make sure the doors seal properly. Keep your refrigerator a few inches from the wall and vacuum its condenser coils every year to help it run more efficiently.