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> I think Bitcoin makes particularly elegant usage of energy, and is getting more energy efficient over time.

She might be hinting at developments where (as an example) mining hardware is being integrated into systems where the waste heat is being used.

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If the work is useful, miners will be incentivized to use that to offset the cost and use more energy, leaving the amount of wasted energy the same.

But we have heat pumps. The heat pumps are pretty well developed technology at this point, meaning for same electricity we could move lot more heat.

Agree. Heat pumps are likely the most efficient way to heat/cool something we'll ever have.

But that's besides the point. The question was whether mining is becoming more efficient, not whether mining can deliver secondary purposes as efficiently as other technology that's specifically designed for those purposes.

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