An environmental control system includes a cooling circuit having at least one heat exchanger for cooling a first medium therein. At least one compressing device is operably coupled to the cooling circuit. The at least one compressing device includes a first compressor and a second compressor, wherein the first medium is provided to the first compressor and the second compressor in series, and a temperature of the first medium provided to an inlet of the second compressor is less than the temperature of the first medium at an outlet of the first compressor.