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Bard part number 8301-067 is an OEM outdoor temperature and humidity sensor used to provide the control board with real time outdoor air conditions for proper unit operation, staging, and diagnostic logic on compatible Bard equipment. When an outdoor sensor drifts out of range or fails, it can cause incorrect readings that affect comfort control and efficiency, so replacing it with the correct Bard OEM sensor helps restore reliable system decisions and accurate monitoring. Match this part by Bard number and confirm compatibility with your unit model and control package before ordering, since sensor style and wiring can vary by series.