Winter fridge assist - using jugs of ice

[Daox]

So, I was reading my latest issue of HomePower Magazine and stumbled across a hopefully good tip. In winter, use jugs of water/ice to assist with cooling your fridge. Basically, a manual heat pump!

So, I think I will be testing this idea. From previous logging, I know my fridge uses ~1.4 kWh per day. I will test this again with 1 week of logging without jugs followed by one week of using the ice jugs followed again by one week without jugs. I currently envision using 2 milk jugs filled with water. I'll have one in the fridge and the other outside cooling down again. I go to work about 5am and get home about 5pm, I will swap these out at those times. If I find that this is insufficient time for the water to freeze outside, I will add another jug to the mix so they have 24 hrs vs 12 hrs to freeze. All the while, I'll be logging the refrigerator power use with a kill a watt.

So, anyone think they have any ideas about this? Think the milk jugs will crack eventually and leak all over? Think that the thermal mass is too small and won't assist cooling much? I'm basically open to any and all discussion.