CO2 transcritical refrigeration systems are versatile and capable of addressing diverse cooling requirements within a single system. CO2 systems can be configured to deliver either low or medium temperature cooling efficiently, with an evaporation temperature reaching as low as -20°C. Alternatively, they can be integrated into a booster system that provides both low and medium temperature cooling simultaneously, with an evaporation temperature as low as -50°C. These systems operate effectively in ambient temperatures from +10°C to +35°C and efficiently utilize the heat generated during the cooling process for additional heating purposes.