Abstract: A point to point, point to multipoint, or multipoint to multipoint integrated inverter compressor variable volume refrigerant loop data center cooling unit and control system used to regulate volume of refrigerant to air handling systems used to supply cold air ventilation to data center rooms and to the electronic equipment mounted therein which require constant cooling by using a control system controlling variable speed pumps, fans, compressors and condensers to operate a one or a plurality of closed loop, variable volume refrigerant loop systems in conjunction with one or a plurality of associated interior air handling systems located within a data center.