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The Bard 8602-064 solid state enthalpy sensor is an OEM controls component used to help Bard ventilation and economizer logic make smarter outdoor air decisions by monitoring total heat content in the airstream. When an enthalpy sensor is drifting or failed, units can bring in too much outside air or miss free cooling opportunities, leading to comfort complaints and higher operating costs. This Bard replacement is built for proper fit and signal compatibility with Bard wall mounted equipment controls, making it the right choice when you need to restore accurate ventilation control and stable system operation. Because Bard has listed this part number as obsolete in some channels, confirm your unit model and any approved supersession before ordering to ensure correct replacement.