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The Bard 8403-038 humidistat is an OEM, non-electronic humidity controller used to manage indoor moisture levels by switching humidification or dehumidification equipment based on a 20 to 80 percent relative humidity setpoint. This control uses SPDT switching and is commonly specified for Bard wall-mount and related HVAC applications where reliable, simple humidity control is needed, with pilot-duty ratings suitable for typical HVAC control circuits. Use it to restore proper humidity operation when the original humidistat is out of calibration, damaged, or no longer switching consistently, and confirm wiring and control strategy match your unit before ordering.