Came here today for a unit not cooling properly…checked system verified charge …fliers is ok …2018 Lennox ..gas furnace 3 zone system …no flood protection on attic system drainage …checked drainage ….refrigerant charge looks fine .no indication of freezing of the system …while ..here or leakage ..static pressure was 0.7..tested both in cooling …system is single stage builders grade on 3 zone application….did explain how the system works in to cooling on zoning on a attic system …did adjust set point at thermostat so basement and main level as suggestion going forward …unit is operating ..