Adjust Water Heater Temperature Settings

Cost savings: $30-$475

The average U.S. house spends $1,900 on heating, hot water and electricity. Hot water represents as much as 25% of that cost, or up to $475, according to the Department of Energy, and much of it is wasted. Turn down your hot water heater so that the tap water isn't scalding, and wash your clothes in cold water, to save 6% or more on your bills — a savings of roughly $30 a year.

If it's time for a new water heater, choose an Energy Star model to save about 7% — or a more advanced technology, like a tankless water heater that can save 30% ($140) or a solar water heater that can zero your bill ($475). While the up-front cost isn't cheap, the investment will pay off over time.