If you're pulling heat from the air though, you're just absorbing solar power efficiently. And this wouldn't be a bad way to do it if you could make it work: at

If you're pulling heat from the air though, you're just absorbing solar power efficiently. And this wouldn't be a bad way to do it if you could make it work: at any given time, there's always sun shining somewhere on Earth, just not where we need it. A heat pump which could extract enough of a differential to power itself using a turbine, isn't impossible. The real issue is such a thing at scale would functionally be a storm generator: you'd be pulling warmer air in the upper troposphere down to ground level, chilling it, and then releasing it.