Why does my thermostat make a buzzing sound when on cool?

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Hi LR! More than likely the buzzing sound is in the 24 volt reversing valve solenoid. On most units other than Rheem, Ruud the reversing valve solenoid is energized the whole time the unit is in the air conditioning mode. So 24 volts is being supplied to the solenoid all the time the thermostat is on “Cool”.

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