What is the only acceptable method for determining required airflow, heating and cooling?

The determination of required airflow, heating, and cooling in a space is best achieved through a room-to-room load calculation. This method takes into account the specific characteristics of each room, including its dimensions, orientation, occupancy, and the heat-generating equipment within it. By assessing these variables, you can achieve a precise understanding of the thermal loads that need to be managed, leading to a more efficient and effective heating and cooling system design.

Using a fixed airflow calculation does not consider the unique conditions present in each individual room, which can lead to inadequate or excessive airflow. An average airflow estimate can oversimplify the complexities of a building's thermal dynamics, potentially resulting in poor temperature regulation. Similarly, relying on a general rule of thumb fails to account for the specific needs of different spaces, which can vary significantly.

By conducting a room-to-room load calculation, professionals can ensure that the HVAC system is tailored to meet the actual demands of each area, optimizing comfort and energy efficiency.