https://energiesparenleichtgemacht.de/wp-content/uploads/2016/06/Energiehäuser-2.jpg11251688Patrick Hollenbeckhttps://energiesparenleichtgemacht.de/wp-content/uploads/2015/08/elg-logo2.pngPatrick Hollenbeck2016-07-19 13:57:302016-07-19 13:57:30Energieeffizienz im Gebäude – Teil 3: Nullenergiehaus
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