We are getting off topic here, so maybe a new thread should be made?
The idea tho of using outside cool/cold to keep your food cold is not new at all, but how do you do it without a net loss? because it have a net gain you need to start with a fridge that is better insulated then your house and you might say that your fridge has better seals and as much insulation as the walls of your house but if we think about the crude idea of just cutting a hole in the back of your fridge and bringing in cold air, you now have all 6 sides of your fridge that are sucking heat out of the room, in other words you have more surface area, but on the other hand the heat that is given off by the fridge is electric heat and if you have gas heat or wood heat in your house it might be cheaper to make up for the small amount of heat loss with gas heat.
I really like however the idea of using the waste heat to heat water, trouble is thatmy understanding of how fridges like to operate it's at 70F or so, get them to hot or to cold and they don't work as well, that is why the fridge in an unheated garage is going to drive your electric bill way up.
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