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Most strategies involve a thick layer of insulation, highly efficient windows, an airtight layer and convenience ventilation with heat recovery. In many cases renewable sources of energy are utilized for covering, or at least partly covering, energy consumption.
Two short videos presenting energy-efficient buildings:
https://www.youtube.com/watch?v=cP2Hm4rzuFI
https://www.youtube.com/watch?v=Prx6rJPZFIE
As can be seen from the following pictures, energy efficiency is not tied to any particular architectural design.
Passive house with solar façade in Austria (source: Michael Paula, bmvit)
Housing estate SunnyWatt in Switzerland, Minergie-P-Eco standard (source: kämpfen für architektur ag)
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