There's no shortage of advice for how to use less energy at home, thus saving both money and the planet. For decades, energy-efficiency advocates have tried to convince Americans to replace incandescent light bulbs with compact-fluorescent ones, use hot water sparingly, wait as long as possible before turning on the A/C, and so on. But not all of these tips are created equal: Some appliances and behaviors use more energy than others. How good a grasp do we have on this crucial information?
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