Spending Time in the Cooler

One random thought that occured to me recently was related to prison management.

Wny not maintain them at say 10C? Punishment blocks at 7C. Good behaviour blocks at 12C.

We may not be able to afford sentence lengths that act as a genuine deterrent, but there is no need to make prison any more comfortable than necessary.

Of course, this would probably be opposed as "cruel and unusual punishment" by the usual suspects.