[halomru]

But there's no reason it can't be. So far there just wasn't a reason

[thatwebdude]

Food safety dictates a minimum chilling temperature, we can't override that without sacrificing health. We can make fridges/freezers more efficient and insulated though. My deep freezer (according to Energy Star) takes $24 a year to freeze my food. That already seems extremely efficient.

[askvictor]

Yes, but it's not going to be retrofitted onto existing fridges. You'd need to replace most of the fridges in the system.