Which is the low side port and which high on a compressor?

The high side port on a compressor is typically the smaller of the two ports and is usually located at the top of the compressor. It is connected to the discharge line, which carries hot high-pressure gas from the compressor to the condenser.

The low side port, on the other hand, is generally the larger of the two ports and is located at the bottom of the compressor. It is connected to the suction line, which draws liquid and vapour refrigerant from the evaporator and carries it to the compressor.