Walter Unterrainer   Austria   With its many days of sunshine but chill, the Austrian region of Vorarlberg has all the conditions to justify the domestic uses of solar energy that are now being discovered. Close to Lake Constance and with the Alps as backdrop, the idyllic town of

Walter Unterrainer   Austria   In the town of Bregenz, where the Austrian region of Vorarlberg reaches Lake Constance, the two houses form part of a green, residential neighborhood. The climate of this area is characterized by low temperatures from the beginning of autumn until th