What does low subcooling signify?

Low subcooling indicates that the refrigerant in the system is not being sufficiently condensed in the condenser coil. When subcooling is low, it typically suggests that the refrigerant is being starved of the necessary amount needed for proper cooling, because there isn't enough heat being removed from the refrigerant after it has changed from gas to liquid.

This situation often leads to reduced cooling efficiency and poor performance of the HVAC system. If the refrigerant does not have adequate subcooling, it can indicate that there is insufficient refrigerant in the system or that there are issues with airflow or other components that prevent the refrigerant from fully condensing. The primary takeaway is that low subcooling points to a problem of insufficient refrigerant flow, which characterizes a "starved" condition.