I performed a 2 system cooling maintenance on 2 RTUs. The systems are not allowed to shut down so I checked them to the best of my abilities. I found that the condenser and evaporator coils were dirty. I performed a cleaning and replaced the filters. I took a temperature rise from the condenser coil to the condenser fan. The systems are cooling to manufacture specifications. 2 condenser cleanings 2 evaporator no rinse cleanings