Can You Unplug Your Fridge at Night To Save Money and Energy?

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This interesting question from Econundrums reader Myk recently caught my attention:

I have often wondered if it would be possible to unplug my fridge at night when I know for certain that no one will need to open it for eight hours. Would the unit keep in the cold if the doors remained closed?

The short answer is no, says LeeAnne Jackson, health science policy advisor at FDA’s Center for Food Safety and Applied Nutrition. “Refrigerators should be maintained at a constant temperature setting at 40 degrees Fahrenheit or below,” writes Jackson in an email. “Numerous foods in your refrigerator might have bacteria on them, and the cold temperature inhibits the bacteria from multiplying (or at least slows it down). If the food warms up, the bacteria will reach harmful levels faster.” For this reason, the USDA recommends that food left in an unplugged, unopened fridge for more than four hours be tossed. (Frozen items left in a full freezer stay good for two days; in a half full freezer it’s more like 24 hours.)

And even if you’re willing to risk spoiling your food (or you only keep in your fridge food that can withstand higher temperatures), the energy savings aren’t significant, since “if the refrigerator is unplugged more energy will be used to cool the refrigerator back down to 40 degrees Fahrenheit than if the refrigerator simply maintains the temperature at 40 degrees,” says Jackson.

Bruce Nordman, an energy efficiency researcher at the Lawrence Berkeley National Laboratory, basically agrees with Jackson. “You do use energy to go back to the original temperature, but should save some with the higher temperature,” he says. “However, the savings are strictly proportional to the amount of time at the higher average temperature, so you only save a lot if the temperature goes way up.” Which, of course, you wouldn’t want it to, given the bacteria problem.

Want to save energy in your fridge? Here are six top tips for maximizing the efficiency of your refrigerator, from the American Council for an Energy-Efficient Economy.

Got a burning eco-quandary? Submit it to econundrums@motherjones.com. Get all your green questions answered by visiting Econundrums on Facebook here.

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SIX TRUTHS

Reclaiming power from those who abuse it often starts with telling the truth. And in "This Is How Authoritarians Get Defeated," MoJo's Monika Bauerlein unpacks six truths to remember during the homestretch of an election where democracy, truth, and decency are on the line.

Truth #1: The chaos is the point.

Truth #2: Team Reality is bigger than it seems.

Truth #3: Facebook owns this.

Truth #4: When we go to work, we're in the fight.

Truth #5: It's about minority rule.

Truth #6: The only thing that can save us is…us.

Please take a moment to see how all these truths add up, because what happens in the weeks and months ahead will reverberate for at least a generation and we better be prepared.

And if you think journalism like Mother Jones'—that calls it like it is, that will never acquiesce to power, that looks where others don't—can help guide us through this historic, high-stakes moment, and you're able to right now, please help us reach our $350,000 goal by October 31 with a donation today. It's all hands on deck for democracy.

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