I remember the iceman giving my friends and I chunks of ice to
enjoy during the summertime. I also remember iceboxes in stores
that were made for soda bottles only. The real key to keeping it
all cold is the water bath you put the ice into, after draining a
bit of water out. The tank that held the water bath was bigger than
the ice blocks and held more 'cold' than just an ice block. I suppose
you could 'harvest the cold' with bottles of water frozen outdoors
and put one or two in your fridge. You would save on electricity.
Keep in mind that, except for labor and transport costs, ice water
from lakes is FREE!
Just a thought,
Wayne