Passive houses  DEC 29 2008

Passive houses -- homes that use "recycled heat" to heat themselves, rather than a furnace -- are growing more popular in Germany and slowly spreading elsewhere in the world.

The concept of the passive house, pioneered in this city of 140,000 outside Frankfurt, approaches the challenge from a different angle. Using ultrathick insulation and complex doors and windows, the architect engineers a home encased in an airtight shell, so that barely any heat escapes and barely any cold seeps in. That means a passive house can be warmed not only by the sun, but also by the heat from appliances and even from occupants' bodies.

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