(4) AC Maintenance - Carrier - Ductless - 410A - Upon arrival client mentioned that system has not been cooling. Checked supply temperature noticed that delta T is low, checked condenser found pressures low. Informed client of issues, client has never added refrigerant into system explained to client that because the system lost pressure there is a leak and refrigerant may need to be added again in the future. Recommended performing UV Test or Nitrogen Isolation Test. Also reccomended to insert Refrigerant 410A client approved adding Freon into the system. Added over 2.lbs of R410, checked each indoor unit supply temperature receiving good temperature split, While on site performed Maintenance on all indoor systems, Checked all primary drain pans ok no leakage at this time, checked delta T on each system receiving good temperature split, sprayed and chemically cleaned each indoor coil, washed the exterior of each unit, brushed off dirt from exterior of louvers, Checked condenser coils