A compressor plant with fluid injection, comprising a fluid circuit of the fluid to be injected, wherein in the fluid circuit are arranged: - a compressor - a heat exchanger, through which the fluid passes for purposes of heat recovery; - a control valve arrangement with two or three control valves (6, 7, 12) for the regulation of the injection temperature of the fluid, and the temperature of the fluid downstream of heat recovery, characterised in that, the two or three control valves are selected from the following list: a) a compressor-side control valve for the regulation of the injection temperature of the fluid, which is arranged in the fluid circuit such that the fluid passes through the valve before it is injected into the compressor; b) a heat recovery-side control valve for the regulation of the temperature of the fluid downstream of heat recovery, which is arranged in the fluid circuit such that the fluid passes through the valve after it has passed through the heat exchanger; c) a control valve for the regulation of the flow of a medium through the heat exchanger, which is arranged in the medium inflow line into the heat exchanger; and in that, - an electronic control unit is provided, which regulates at least one of the control valves (6, 7, 12) by means of an algorithm, wherein the required temperatures for the heat recovery medium flows (4, 5) are entered into the control unit as parameters. - a compressor - a heat exchanger, through which the fluid passes for purposes of heat recovery; - a control valve arrangement with two or three control valves (6, 7, 12) for the regulation of the injection temperature of the fluid, and the temperature of the fluid downstream of heat recovery, characterised in that, the two or three control valves are selected from the following list: a) a compressor-side control valve for the regulation of the injection temperature of the fluid, which is arranged in the fluid circuit such that the fluid passes through the valve before it is injected into the compressor; b) a heat recovery-side control valve for the regulation of the temperature of the fluid downstream of heat recovery, which is arranged in the fluid circuit such that the fluid passes through the valve after it has passed through the heat exchanger; c) a control valve for the regulation of the flow of a medium through the heat exchanger, which is arranged in the medium inflow line into the heat exchanger; and in that, a) a compressor-side control valve for the regulation of the injection temperature of the fluid, which is arranged in the fluid circuit such that the fluid passes through the valve before it is injected into the compressor; b) a heat recovery-side control valve for the regulation of the temperature of the fluid downstream of heat recovery, which is arranged in the fluid circuit such that the fluid passes through the valve after it has passed through the heat exchanger; c) a control valve for the regulation of the flow of a medium through the heat exchanger, which is arranged in the medium inflow line into the heat exchanger; and in that, - an electronic control unit is provided, which regulates at least one of the control valves (6, 7, 12) by means of an algorithm, wherein the required temperatures for the heat recovery medium flows (4, 5) are entered into the control unit as parameters.