I get that, but you need fairly high grade heat to generate power. The idea would be to move enough heat from lower grade sources to a reservoir that is then ho

I get that, but you need fairly high grade heat to generate power. The idea would be to move enough heat from lower grade sources to a reservoir that is then hot enough to generate more power than is required to move the heat in the first place. It's effectively harvesting the ambient air temperature. I don't know that you could pull in that much heat, and I suspect that an analysis of the system might show that it can't yield useful work.