lsparrish comments on Crazy Ideas Thread - Less Wrong
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Cooling cost require liquid nitrogen. It's expensive. That's partly why MRI scans are expensive and why storing cyronics bodies is expensive.
It depends on the scale you are working at. A large body with no internal heat source can be kept cold over time at a lower cost because only the outside needs to be insulated. If cryonics were at the scale of a large cryogenic warehouse, it might be much less expensive.