The more heat that is produced by electronics, the lower the temperature of equilibrium will get when they switched off electornics in A13. So the craft would have gotten very cold, which it did. Note that the cooling of A13 was largely passive, i.e. you could not switch it off because it was just a product of the materials used and passive radiators. All designed to make a comfty equilibrium when all electronics ran and produced heat, so cooling too much when the electronics were switched off.

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