Residential service call for a customer in Allen and Upon arrival found that the upstairs system wasn’t cooling. Checked indoor unit and found everything operational. Checked outdoor unit and found pressures low. System is missing about half of not more of its charge. Did a visual inspection on refrigerant system and didn’t see any major signs of oil anywhere. Recommended doing a leak search, homeowner wanted to hold off. Condenser is a R-22 therefore if we find a leak in the evaporator coil we would be unable to charge it again. Gave options on warranty evaporator coil, changing out condenser and replacing disconnect box.