This paper presents an experimental study on a dual-temperature refrigerator system employing a double-suction piston compressor. The system’s working principle involves a secondary suction port on the compressor cylinder, enabling quasi-secondary compression to enhance refrigeration capacity. A test bench was built to evaluate performance under varying ambient temperatures (16 °C, 25 °C, 32 °C) and compressor frequencies (40–100 Hz), with comparisons to a single-suction compressor system. Results show that as ambient temperature rises, the freezer’s refrigeration capacity decreases significantly, while the refrigerator’s remains stable, and compressor power consumption increases with shorter off-periods. Higher compressor frequencies accelerate the freezer’s cooling rate more markedly than the refrigerator’s. When operating alone, the refrigerator maintains a stable exhaust temperature (60–65 °C). Compared to the single-suction system, the double-suction system increases refrigeration capacity by 12–24%, reduces exhaust temperature by 3–8 °C, and exhibits stronger adaptability to rising ambient temperatures, improving operational reliability and service life. This study provides experimental data for advancing double-suction compressor technology in dual-temperature refrigerators.