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> The additional energy to create that heat doesn't have to equal the time saved.

Right, it doesn't have to, but it's also possible that more heat makes it take proportionally less time (or close enough, with negligible decrease in efficiency).

Obviously, yes, using a heat pump will use less energy than a resistive heating element. But the question is more about how much and how quickly heat is input (regardless of how it was generated) and how that affects drying times.




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