Final answer:
Overcharging a refrigeration system with refrigerant will increase the head pressure, leading to possible compressor damage and inefficiency.
Step-by-step explanation:
A refrigerant overcharge would increase head pressure within a refrigeration system. When too much refrigerant is added to the system, it can lead to an excess of liquid refrigerant in the compressor and higher pressure throughout the system. This can cause the compressor to work harder, potentially leading to equipment damage and inefficient system operation.