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Bard 8408-034 is an OEM outdoor thermostat with a fixed 75F setpoint and SPDT switching, used in Bard HVAC equipment to help stage or change system operation based on outdoor temperature. When this temperature switch is operating correctly, it helps the unit follow the intended control sequence for comfort and equipment protection in applications where outdoor conditions determine which heating or cooling functions are allowed. This replacement is the correct choice when troubleshooting a unit that is not transitioning properly by outdoor temperature or when the original outdoor temperature switch has drifted, stuck, or failed, and matching the exact Bard part number ensures proper fit and reliable electrical switching in the factory control circuit.