Today we came out for only system not cooling properly 2014 Lennox four ton ac with matching 90k furnace. Client let me know on arrival that evaporator coil had been replaced a year after moving in and client has owned property for ten years. Inspected complete system checked heat exchanger with digital camera found severe metal fatigue and hot spots due to age and zoning. Cycled equipment from both thermostats in cooling mode found system critically low on refrigerant causing low pressure switch to open. Circuit has refrigerant leak, performed courtesy electronic leak search found leak on bottom of evaporator coil. With coil leaking compressor has lost lubrication and has been compromised. Blower motor bearings are worn out and very loud on start up. Contactor is severely pitted on condensing unit and condenser coil is impacted with dirt. Client has single stage builder grade equipment with zoning. Let customer know the proper set up would be a fully modulating communicating system. F