Someone smarter than me can probably answer this hypothetical: If scaled up, would this device become a heat pump? Extracting energy from the electromagnetic field via the Casimir effect would seem to transform random field fluctuations (i.e. "heat") in the environment into the movement of electrons down a conductor. If those electrons are sent away to do work elsewhere, to my mind that's a transfer of heat from one place to another. Moving 0.5W of heat isn't very interesting, but I wonder if there's a scaling up that would let you move meaningful amounts of heat around in this manner while generating electricity as a "bonus".

The market for moving heat around is pretty enormous.

I’ve always wondered if energy was “sussed” from the vacuum, if it would affect the density of matter or something. You know, how there are theories that space is expanding, not only specially but also in terms of density, if we could tap that and accidentally entrap ourselves by making our locality more dense and therefore less traversable (escaping Earths gravity for instance.)

Maybe just a crazy idea, I have no idea what I’m talking about!