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Bard W18AB-W18HB is an OEM heat pump upgrade package designed to convert a compatible W18AB wall-mount air conditioner configuration (including W18AB-A05XWXXXJ) into a W18HB heat pump setup so the unit can provide both cooling and heat pump heating. This upgrade is intended to maintain factory-style fit and proper system operation when you need to add heat pump capability without changing the entire wall-mounted chassis, but model and revision details matter, so confirm the full unit model number, electrical characteristics, and required accessories in the Bard documentation for your specific W18AB configuration before ordering or installing.