When sourcing R290 (Propane) compressors, you must prioritize Cooling Capacity (BTU/h or W) and the Coefficient of Performance (COP). Since R290 is a natural refrigerant with high thermodynamic efficiency, ensure the compressor is specifically designed for High Back Pressure (HBP), Medium Back Pressure (MBP), or Low Back Pressure (LBP) applications depending on your equipment. Additionally, verify the Displacement (cm³) and Motor Type (e.g., CSR or RSIR) to ensure compatibility with your system's starting torque requirements.