Quote from Fractals 'R Us:
One thing I like about Obama is he is thinking in terms of alternative energy. Solar is my favorite, there is a hell of a lot that can be done to conserve electricity on one side of the equation and a lot of room for solar to generate electricity. I lived in the Mojave Desert for a long time. They build houses there and put in central air... I realized over time that if they just built a second roof over a house to keep the direct sun off of it the cooling cost would come way down.. and I met a guy that had a house built with a very thick slab that had air passages in it... at night he ran a squirrel cage fan that cooled the slab and the house never got that warm in the day.. total cost was a fraction of the central air thingy... ideas don't get into the real world until there is an economic reason... energy will have to go out of reach of people before they will even think about conservation, history bears me out on that for sure...
That's a neat idea with the building of two roofs. That is actually a very good solution for people living in dessert areas.