The MRCOOL MLACK Signature Series Low Ambient Kit is an HVAC accessory designed to maintain reliable cooling performance in low outdoor temperature conditions. It works by regulating system operation, including condenser fan performance and refrigerant pressure, to ensure stable cooling when ambient temperatures drop. Commonly used with compatible MRCOOL Signature Series air condition... https://www.partshnc.com/mrcoolr-signature-series-low-ambient-kit-mlack