I was watching various sterling engine videos on youtube and it looks like an interesting concept. Makes me wonder why it is not put to use more.
I was thinking, this would probably work better in very hot climates, but why not have a big sterling engine that uses the attic as a heat source, and the the indoor as the cold air source? The temp difference should be decent to at least get some kind of displacement, no? This energy could be used to help cool down the house, or something.
Or how about a sterling engine generator? It would have a parabolic dish you point to the sun, and you have yourself a fuelless portable generator. Perfect for camping, or boating etc. I don't know how much watts you'd get out of something that is small enough to carry though. Is it insignificant? It seems to me this is a more efficient method of using the sun, then solar power as solar panels are only like 10% efficient, or something like that.