I arrived for a 2 system summer tune up. I spoke with the homeowner and found that both systems are running as expected. I inspired both systems and found one system to be out of filters. I made this aware to the homeowner and we decided to order new filters. I inspected the other system and found the system to be running low on R22. I showed the homeowner my find and we decided to only add refrigerant to the system to get it running properly and not preform a leak search at this time. I explained that there is no warranty on refrigerant without preforming a leak search and repair or replacement the leaking component.