I went into my attic and found some magazines fron the mid 70's just after the first energy crisis. Better Built Energy effecient Homes. You would be amazed at the train of thought of that era . The golden age of alternative energy thinking. None of the mags articles are in print or internet searchable. Geothermal extraction is discussed. There were solar units that extracted heat from even 40 degree water on cloudy days Effectiveness was discussed if only 100 degree of liquid transfere median were obtained. Complete design with illustrations of how to design and build you own solar pannels and collection systems. And not just roof top collectors. One neat example was a triangle device called a heat box where sun exposure heated the box and interior collectors absorbed the heat and transported it to a storage tank. Craig Warran BEgreen I am going to photocopy this PM me if interested I will send you one Could make a great wiki. Also explained is the advantages of southern exposure and pasive solar gain. The advantages of building into a hill in northern exposures . Many of what I incorperated into my home 30 years ago I have to check the attic again as I researched everything I could get my hands on. I know I have that era complete wood stove review and the technology of building them at that time. Even the specs of the major manufactures of that time, including advertisements. Again wiki time. I just hope I did not give in and throw things out when my wife was in one of those moods. I also have a lot of Saturday evening post of the early 50's One would be amazed at the advertisements the energy saving claims and new technology. PS what ever happened to the gas burning refrigerators. I grew up with one, that never broke down it lasted over 25 years without one repair. If someone here is interested and wants to to take a trip down memory lane, and is willing to send the magazine back. Is willing to scan reproduce it for Hearth.com. I am willing to send it to them, providing they send it back when done. Some will appreciate Majestic mod style pre fab wood burning fireplace in 70's accent colors.