Wouldn't be hard at all if you used thermistors. Could just add a potentiometer inline with the thermistor for air or water temp and adjust the resistance so it was reading 10C lower than it actually is. Then when the comparator sees the coldplate temp as being equal to the other probe then the coldplate is actually 10C below water or air temp. I haven't messed with thermistors all that much, but I think this should work properly.
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