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in cold climate you mine bitcoin to warm up your house or you will feeze to death, or you can just let the electricity make heat doing nothing.

Peter Lothberg heated his mother's house with a Cisco router according to his talk about running a fibre ring around the world.

Right but running a heat pump or burning biomass is also a preferable choice for heat production.

heat pump at -30 and lower is well just the same effect as mining bitcoin, i guess on warmer days it would work.