Arrived in Smithville for AC Maintenance, Upon my arrival I evaluated 2 strait cool systems. I verified system safety and performance is to manufacture specifications. Flushed and treated the water removal system. Cleaned the electrical cabinet and washed unit using water. Found unit #1 heat transfer media coil completely frozen and we were unable to perform an evaluation. An after hours was scheduled to perform a diagnostic. System #2 the voltage enhancement system for the outdoor condenser was found low. The customer wants to wait until 6/7/25 to make a decision about replacing the voltage enhancement system.