Complete: 2 systems worked on Both Units: Carrier split HPs: HO said both units weren’t cooling to desired temp. Delta T was 10° DS and 5° US. On the US and DS systems both were low in refrigerant. Added 2lbs of 410 , leak seal and hard start to both. Checked Temps again and the DS was 17° and US was 20°. Systems working great at this time.