This concept may sound bizarre, but it's feasible in cutting-edge green homes that are so well-insulated, they don't need a furnace or boiler. They'll stay warm simply with body heat. A hairdryer might also suffice.
"It's like living in a glass thermos," says John Eckfeldt, a physician who built one of these "passive" homes in frigid Isabella, Minn. He says the inside temperature is so even that if he sees snow falling, he's surprised to realize it must be cold outside.
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