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The Bard 8408-037BX Return Air Thermostat is an OEM temperature sensing control used in Bard wall mounted air conditioners and heat pumps to monitor return air temperature and help the system maintain stable comfort and proper cycling. This boxed replacement thermostat is built for dependable operation in commercial and institutional applications where accurate return air control supports efficiency and protects equipment from unnecessary run time. Use Bard part 8408-037BX when you need a direct fit OEM control component to restore original temperature regulation performance, and confirm compatibility by matching your unit model and existing thermostat specifications before ordering.
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.