Completed AC maintenance on four split units; 1 yr 5 ton AC Pro closet unit, 34 yr 2.5 ton Day and Night closet unit, 34 yr 3 ton Day and Night closet unit, and 19 yr old Lennox hydronic heat closet unit; cleaned all four condenser coils, replaced all filters with filters provided; all condensation drain lines cleared; Recommend replacement of Master-Bedroom HVAC with new 3 ton unit.