Turn the heat up (or down).
About 47 percent of the average household's annual energy bills stem from heating and cooling, according to the U.S. Department of Energy. Adjusting your thermostat is free, easy and can yield big savings.
Every degree you raise your thermostat in the summer will reduce air conditioning bills by about 2 percent, said Jeff Deyette, energy analyst with the Union of Concerned Scientists. Lowering the temperature by one degree in winter will save you 3 percent on heating bills.