22. Turn down the thermostat on your water heater
If, when you take a shower or a bath, you aren’t turning the temperature close to as far as it will go for your hot water, you’re probably spending more than you need to heating your water. You water heater may be set to a temperature that’s higher than it needs to be, so it’s always maintaining that high temperature for you, wasting energy. Try lowering the heat setting incrementally over a few days until it’s a level where you’re able to get water as hot as you like it — but not much hotter.