If rising fuel prices are chomping away at disposable income, some relief may be on the way. No, prices at the pump won’t be falling any time soon. (Americans already spend over $160 billion annually to heat, cool and light their homes, according to the Department of Energy, a figure unlikely to fall anytime soon.) But savvy consumers can save a bundle on their energy bills—as much as 30% a month—by making even modest changes to their at-home routines.