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This is the Cohens' home.
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It's a three-bedroom house in a suburb in the United States.
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It's a nice area, but there is a problem with this house:
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it uses a lot of energy.
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But this isn't surprising.
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Houses and buildings use 40 percent
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of all the energy in the United States.
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And many homes waste a lot of energy.
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Amory Lovins teaches people to save energy in their homes.
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Today, he is visiting the Cohens' house.
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Lovins walks around the house, and he finds different problems.
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There's a problem with the heater in one room...
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and the freezer in the kitchen.
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Oh, what have we here?
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We don't have to use a lot of electricity
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in our homes, says Lovins.
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There are simple ways to save energy.
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It's surprising; homes waste a lot of energy,
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even while you sleep.
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To save energy in your home,
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unplug electronics when you're not using them.
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Do you see that little red light down in the corner?
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Now, the TV is off,
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but it's still using energy because it's plugged in.
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The Cohens pay $60 every year for this extra energy.
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The Cohen family has lots of electronics.
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They're all plugged in.
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So they're always using energy.
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Lovins lives in Aspen, Colorado, in the mountains.
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His house is very eco-friendly.
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All of the home's electricity comes from solar panels.
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Some days, it's below -40 degrees Celsius here.
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But Lovins' house is warm...
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...thanks to the solar panels.
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In fact, Lovins' whole house uses very little energy:
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only 120 watts.
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That's a little more energy than you need
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to turn on one light bulb.
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It's a very eco-friendly home.