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Don't write it off because of that, the Romans invented the Steam engine like 1800 years before trains, they just wrote it off as a child's toy.
A lot of shit generates an insane amount of heat, if we can harvest the temp differential a couple times during cooling process, it's literally free energy. Even if it just runs the fans/pumps in the cooling. It would be somewhat self regulating even, although we couldn't rely solely on this or we'd run into the same issue as nuke reactors with positive power coefficients.
Quick edit:
Even just some kind of battery tech that removes excess heat and turns it into battery cooling or even trickle charging back to the same battery.
Small shit is what's truly groundbreaking, because it can be applied to damn near everything for almost nothing.
You don't need a high tech solution. A buried salt and sand pit can store enough energy to heat a house all winter in Northern Canada.
Drake landing. Sand batteries are cheap and easy but you are fighting oil and gas politicians.