Upon arrival, I found that the system is low on R22. I spoke with the home owner about the issue. I explained that, I no longer carry R22 and can give a price for a new system. The customer explained that they would like to limp it along for a bit longer. I told her to keep us in mind when they are ready for replacement. System is still down. I had to research the equipment but according to my research the outdoor unit is from 1979.