No, cable TV boxes are NOT the 2nd biggest energy users in many homes


Unless ‘many’ means about seven homes in all of North America.

As my friend Brian Piccioni likes to say, to many reporters the word “energy” is equivalent to “magic”: once they start talking about electrons, their brains turn to mush, and basic math and fact checking fly out the window.

This week’s version is from the LA Times, and the headline is not an overzealous contribution from some editor. The second paragraph ends with the sentence: “They [set top boxes] have become the biggest single energy user in many homes, apart from air conditioning.” There’s even an adorable little infographic showing the “power hog” devices. (I like the bit where the pig noses are power plugs: infographics #FTW!)


But it is almost impossible for that to be true. According to the reporter’s own data, the average set top box (STB) uses about 35 watts per hour while on standby. There are 224 million STBs in the US, and about 110 million homes, meaning the average home has two of these ‘power hogs.’ At 24 hours per day times two devices, that is 1.68 kWh per day. That’s not nothing, but how does it compare to other energy users?

There’s no question that air conditioners are huge consumers of energy. But so are refrigerators: the average (energy efficient!) fridge is around 750 watts per hour, and the average one runs 5-10 hours per day. That’s a minimum of 3.75 kWh per day, or more than four set top boxes. Do you have hot water in YOUR home? A water heater runs at 4,000 watts, and about 3 hours per day: 12 kWh daily, or over seven STBs. Clothes dryers are another culprit: at 3,000 watts per hour, if you spend even half an hour a day drying your clothes, that is more than the average home with two cable boxes.


We haven’t even touched the big energy use: space heating. Lots of homes have either all-electrical heating, or at least a few baseboards. They aren’t on year round, but when they are, the dials on your electric meter will be spinning: the average home uses nearly 30% of its total energy consumption for heating over an average year. That’s even more than air conditioning.

So it is technically possible that there are some American homes where STBs are the second biggest user of energy. But they would need to have a dozen cable boxes, be in Hawaii, not own a fridge, and bathe in the ocean. Or be this guy:


[To be clear, “vampire energy” consumption by set top boxes – or any appliance – is a serious issue. There absolutely need to be changes in how STBs run in sleep mode. But bad energy math is still bad energy math. Millions of Americans could start unplugging their set top boxes, and think they are saving the planet. At 35 watts per hour, STBs are nowhere near the top of the list of energy conservation measures that we should be thinking about.]


Tags: , , , , , , ,

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s

%d bloggers like this: