1) In early times, buildings had great fuel consumption but low comfort, while today's buildings have no energy use but much higher comfort. 2) Passive houses in Germany use little energy but provide high comfort through good insulation of walls, roofs, floors, and use of efficient windows, ventilation systems, and insulation techniques. 3) Passive house design principles can be applied to new construction or renovation of existing buildings, as demonstrated by examples in Gutach, Freiburg, and a renovation project.

1. Meinhard Hansen Architekturbüro solar info center Freiburg [email_address]

2. I In early times : Great fuel- consumption but low comfort

3. today : no use of energy but much comfort

4. Need of energy in german buildings

5. Passive house ISIS

6. Passive house in Gutach / Black Forest

7. Passive house Sunnyside view on the balkonies / sun protection

8. Passive house Quartett & Co

9. Passive houses also for renovation

10. The same building after the renovation

11. new old

12. The principe of Passive houses

13. ...am Anfang war das Feuer Isolation of the wall

14. Isolation of the roof

15. Isolation of the cover

16. Isolation

17. ...am Anfang war das Feuer Different window systems

18. Ventilation system

19. Balcony support outside the isolation

21. Blower Door Test

23. Good isolation leads to higher comfort

24. Thank you for your attention