Thanks to all. So a mere factor of 1000 error! Bah! I went over those calculations at least three times. I guess I had been opening and closing the door for beer too much or something last night - at least now I don't have to feel guilty about getting more beer out. Someone said that if the cans are different sizes then the packing density will be even worse but that's not quite true if one has really skinny cans that fit in the spaces between the big cans and then an even more tiny set to fit in those spaces and etc. That's why concrete has rocks, gravel, and sand. I think it may have been Russell that said a major loss is through the insulation, so why not have refrigerator blankets like the water heater blankets? > so, 50kWsec/60= 833 KWmin = 13.8 KWhr at $.10/KWHr = $1.38 / cooldown > Can this be so? I'm never gonna open that sucker again as long as I > live!! At least not till I need the next cold beer. 50kWsec = 0.833 KWminutes=0.0138 KWhrs=0.1 cents per cooldown -- Looking forward, Al Shinn -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist