How do you perform a temperature rise test in an HVAC system?

To perform a temperature rise test in an HVAC system, the primary focus is on measuring the return and supply air temperatures. This method involves taking temperature readings from the air as it enters the heating unit (return air) and as it exits into the living space (supply air). The difference between these two temperatures indicates how effectively the heater is raising the temperature of the air as it passes through the system.

This process is crucial because it helps determine if the HVAC system is operating efficiently. A proper temperature rise also ensures that the system is not working harder than necessary, which could lead to increased energy consumption and wear on mechanical components. By measuring these temperatures, technicians can diagnose issues like insufficient heat output or airflow problems, ensuring the system operates within manufacturer specifications.

The other choices do not accurately represent the procedure for conducting a temperature rise test. For example, measuring outside temperature does not provide information about the system's performance. Recording thermostat settings alone would not yield relevant operational data regarding the heating effectiveness. Counting heating cycles gives a general idea of system operation but does not provide specific temperature differential insights critical for assessing heating efficiency.