> This sort of thing would call for a centralized compressed lines
The exchanger doesn't need to be the working fluid. You could have Freezer | Fridge | Ground | 30 degree water | 70 degree water
With each | indicating water or another coolant in an insulated pipe. Insulate each reservoir and place it inside/outside depending on climate.
Insulation on longer runs of piping might need to be exotic and expensive (aerogel or double walled vacuum sections), but there wouldn't be much of it.
We already do something similarish for some AC systems
The exchanger doesn't need to be the working fluid. You could have Freezer | Fridge | Ground | 30 degree water | 70 degree water
With each | indicating water or another coolant in an insulated pipe. Insulate each reservoir and place it inside/outside depending on climate.
Insulation on longer runs of piping might need to be exotic and expensive (aerogel or double walled vacuum sections), but there wouldn't be much of it.
We already do something similarish for some AC systems