1980 Press Photo Furnos dog geothermal home

Caption: The Furnos' dog, Claude, lounges in the glassed-in sun porch on the south side of the home. The sun's energy enters there, then rises to the open attic space. As the heated air cools, it travels down the gap between interior and exterior walls to a crawl space under the house.

The front and back of this photograph are pictured below.