Swedish 'Thermos' House Offers Low-Emission Life : TreeHugger

The HVAC system recycles air warmth - there is no furnace in the house so appliances, body heat and sub floor heating do the extra work to keep the house warm in winter. The house, as designed, is said to be approximately "80 percent efficient," [What does that mean, exactly?] and the family will get their remaining required electricity from Vattenfall's wind and hydro power.
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The lucky winners of Wingård's Thermos house will also receive Volvo's C30 DRIVe Electric car for their transportation needs, and the plan is that some electricity generated from the banks of solar panels will be used to charge the car, which requires eight hours for a full charge that lasts for 150 kilometers.
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But the One Tonne project is aiming to give a family an equivalent quality of life that the average Swedish family now has, only with much lower emissions - about one tonne per person per year.