9. Get a solar water heater
No matter whether your water heater is powered by gas or electricity, it will cost you money to run. You can save money and use only renewable energy by opting for a solar-powered water heater. Yes, it will probably cost a meaningful sum to purchase and install, but that expense can be more than made up for over time. One estimate from the folks at the Energy Star program is that a solar water heater will save, on average, between about $100 and $200 per year in energy costs.