In the present work, an evolutionary tuning is used to determine in a coupled manner the controllers of a refrigeration system (VCRS) proposed in the challenge of the 2018 IFAC Conference on Advances in PID Control. The evolutionary strategy finds the parameters of the controllers that best satisfy the problem, fulfilling all the requirements and restrictions imposed by the challenge. The evolutionary strategy is independent of the structure and domain of the model, both the plant and the controllers.