A/c tune up in Lawrenceville, home owners have the house for sale, checked both systems, 1st unit is located in the basement (main level ) system is cooling at this time, unit has a 20° split, blower wheel is clean, evaporator coil is clean didn’t fine any leaks, checked all electronics and components they are good, drain line is clean. Outdoor unit is rusty but still working properly, pressures are good. 2nd unit is located in the attic, ( upper level ) system is cooling at this time, unit has 73.4° from the return and 55.4 from the supply unit has a 18° spilt, blower wheel is clean, evaporator coil is clean but a bit rusty didn’t find any leaks at this time, drain line is clean, both filters are good. Outdoor unit is old and had to add a bit of refrigerant, but system is still working properly at this time.