Jack, fyi I performed an interesting test on the cool collar.You might try it if you haven't installed it yet. Put a cool collar on a plate or in a bowl and a similer sized tin can on the same type surface . Then fill them both with equal number of ice cubes. put a clock or timer on them and note the amount of time it takes the ice to melt.In the test I did it took about 1hr 15min for the ice to melt in the cool collar ,at which time the ice in the can had only melted about 40%. The cool collar had increased the thermal transfer quite dramaticaly ,although
I am not sure my wife will let me use the kitchen for testing anymore.
Jerry 78 911 SC
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