Variable Refrigerant Flow:-(VRF) HVAC systems consist of outdoor units connected to multiple indoor units via refrigerant piping to provide cooling and heating to individual zones.
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Air-cooled package units are generally roof mounted, and are recognizable by the presence of ductwork leading to and from the unit and the operation of compressors within the unit
Water-cooled package units are ceiling mounted and have a cooling tower on the building roof