I am interested in pursuing the modernized redesign of the eistein refrgeration system. It is a refrigeration system using anhydrous ammonia, liquid butane, and water. It is contained in a closed pressurized system, has no moving parts or compressor, and requires no maintenance. Sounds like a fancy, but it is certainly real, last I heard is that AB Electrolux of EU. owns the intellectual rights to prevent the competition from develpoing a competitive system. This could help reduce the amount of energy used to heat/ air-condition homes accros the world. If a more efficient system could be used, or possibly the design changed to accomodate large buildings then this is certainly a worthwhile idea to apply to pretty much anywhere. The idea is that as one end gets warmer the other end gets equally colder, in other words you use an end outside inside a solar oven in the summer, nd as it reaches super high temps the other half that is inside of the house gets very cold, it would therefore only require a small amount of va to run a fan accross the cold end to air-condition the home. In the winter and on cold days the house would be able to stay a bit warmer than the outside ambient air temp, the efficiency of this could be increased if the home was underground.