Locate your wall thermostat. Some homes have dial thermostats and others have programmable thermostats.
Turn your thermostat on and wait until your home warms to a comfortable temperature.
Turn the dial on your thermostat 10 degrees Fahrenheit lower than the temperature in your home. Or press the temperature button down on your programmable thermostat until the temperature is 10 degrees Fahrenheit lower than the temperature in your home. On average, you should set your home thermostat between 68 and 72 degrees Fahrenheit.
Locate your water heater. Most water heaters are housed inside a utility closet, in the basement, or outside near the back of the home.
Locate the temperature gauge attached to the bottom region of the water heater.
Turn the dial on the temperature gauge 10 degrees Fahrenheit lower than the original temperature setting. You should set the average temperature for your water heater between 115 and 120 degrees Fahrenheit.