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The Bard 8408-028BX is an OEM outdoor thermostat used in Bard wall-mounted HVAC and heat pump applications to stage or enable specific heating functions based on outdoor air temperature. This control helps the unit respond correctly as weather conditions change by switching circuits at set outdoor temperatures, which supports proper comfort and efficient operation. When replacing an outdoor thermostat, confirm the original part number and wiring location in your Bard service literature, since outdoor thermostats are commonly used for low-ambient and heat staging logic on compatible Bard equipment.
Bard uses suffixes like "BX" to manage parts internally. These do not change the physical form or function of the part.
A part number ending in "BX" simply means it is packaged in a box for shipping, rather than for internal assembly use.
Example: 8406-142BX is physically identical to 8406-142.