Adding refrigerant may not solve the full problem if the system has a leak. It may help the system operate for a time, but the correct next step depends on what testing shows.
Some leaks may be repairable. In other cases, the age, condition, and equipment requirements may affect which options are available. A low reading does not mean the system automatically needs to be replaced.
The important part is understanding the findings before approving work. Heating and Cooling Matters can explain whether a recharge, leak repair, or another AC repair option makes sense based on the inspection.