When performing indoor air balancing tests, how should the thermostat be set?

Setting the thermostat to bring on the indoor fan on mid-high speed is critical when performing indoor air balancing tests. This approach ensures that adequate airflow is achieved throughout the space being tested. When the fan operates at a mid-high speed, it helps to effectively circulate the air, allowing for a more accurate assessment of how well the air is distributed within the different rooms or areas of a building.

During the air balancing process, the goal is to identify and address any discrepancies in airflow, ensuring that each space receives the desired amount of heating or cooling. Using the fan at a higher speed aids in detecting imbalances and allows for adjustments as needed, helping to achieve optimal comfort and efficiency throughout the system.

In contrast, other options may not provide the same level of effectiveness. Operating the compressor alone would not facilitate proper airflow distribution, and low-speed operation would limit the ability to properly assess air movement. Defaulting to auto mode may not allow the technician to control the fan speed specifically for the balancing procedure. Thus, setting the thermostat to bring the indoor fan on mid-high speed is the best practice for effective air balancing tests.