Created: 2021-01-16T19:12:27-06:00
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Thermoelectric modules: reclaiming waste heat from an oven or space heater with a power generator.
Any energy not converted by the generator remains heat, which was desired by the original usage (oven, space heater) anyway.
Fan cooling: using a fan to force air back in to the chamber which makes the process require less wood fuel.
Rocket mass heaters: efficient use of solid fuel but frowned by building codes.