Completed two preventative maintenance on two carrier units. Carrier - M# CA13NA0300NGAABA - S# 3116X65026 The split temperature was 18, made sure all electrical connections were tight and secure. Performed a amperage readings on the blower motor Condenser fan, and compressor all are operating properly. Water tested the drain from the evaporator coil. Changed out 16x25xx4 filter. Carrier - M# CA13NA0240NGAAAA - S# 4016X63166 The second unit split temperature was 19. Made sure all electrical connections are tight and secure. Performed a amperage readings on the blower motor, condenser fan motor, and compressor they are all operating properly at this time point. Water tested drain line from the evaporator coil. System is operating properly at this point