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Bard 8408-015 is an OEM defrost thermostat used in Bard wall mounted heat pump equipment to help control the defrost function by switching based on coil temperature, supporting reliable frost removal and stable heating performance in cold weather. With the listed 32/57 temperature rating, this thermostat is designed to open and close at specific temperatures so the system can initiate and terminate defrost correctly, which helps prevent extended defrost operation, nuisance lockouts, and reduced airflow from icing. Use it as a direct replacement for the same Bard part number, and confirm application by unit model and wiring configuration before ordering to ensure proper fit and correct system operation.