Upon arrival to no cool call, the homeowner had concerns about his system not cooling to the desired temperature. Went outside to the C/U to verify refrigerant. I found the system to be low on R410a refrigerant. Added 2lb R410a refrigerant and cycled the system. System is now running well with proper pressures. Spoke to the homeowner about the system leaking from somewhere. Due to oil in the drain pan I was expecting the leak to be in the evaporator coil. Upon leak search I was unable to find the leak at this time. Will need to return later this afternoon with UV dye to add to the system to help find the refrigerant leak. Should be coming back anytime after 2pm. I left the system operating in the cooling mode, collected payement/signatures for work completed and left. Job complete. Thank you for choosing Total Air!