What is the next step for temperature readings after cleaning the pipe?

After cleaning the pipe, taking the temperature at the outlet of the evaporator is the next logical step because it provides critical information about how effectively the evaporator is operating. The outlet temperature indicates the heat transfer efficiency within the evaporator, revealing how well the refrigerant is absorbing heat from the space it is cooling. This measurement is vital for diagnosing the performance of the HVAC/R system and can help identify any issues that may have arisen before or after maintenance, such as restrictions, insufficient refrigerant flow, or other performance-related anomalies.

Gathering data from the evaporator output specifically informs whether the cleaning had a positive effect on the system's cooling performance. It directly reflects the cooling capacity and overall efficiency, which are essential for optimal system operation.

Other options, while potentially valuable measurements in a comprehensive diagnostics process, do not provide as immediate or focused an insight into the performance impact of the maintenance work performed on the pipe as measuring the evaporator outlet temperature does.