Did you put the chiller loop on a thermostat?
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So, when you say grounded vs not, does that mean the grounded group was in contact with the floor vs the 'not' group up on tables or something?
And to what do you attribute the difference? Maybe closer contact to the earth's magnetic field, or more in touch with earth vibrations, something else?
Whatever it is, interesting results. And what caused you to conduct the test?