Adjust your day-to-day behaviors

“The behavior adjustments that have the highest potential for utility savings are turning down the heat on your thermostat in the winter and using your air conditioner less in the summer. Heating and cooling costs constitute nearly half of an average home’s utility bills, so these reductions in the intensity and frequency of heating and cooling offer the greatest savings.”

https://www.energysage.com/energy-efficiency/101/ways-to-save-energy/