Upon arrival, I found the customer’s heat pump split system not cooling properly due to a low refrigerant charge. After finding the system low on Freon, I performed the electronic leak search to find the evaporator coil leaking. The customer decided to top the system off for now. I sent an estimate for 5 pounds of refrigerant. They approved the estimate. After adding the Freon your system is cooling properly at this time. The customer was also interested in a proposal for options on a new system install which is what I highly recommend. your system is 20 years old and I would hate for you to spend money on the repair then something else possibly go down in a few months. There is no guarantee to how long the refrigerant I added will last other than that your system is operating properly at this time.