The duct system of a 7.5 ton package heat pump should be designed for what normal airflow?

To determine the normal airflow for a 7.5 ton package heat pump, it's important to understand the general rule of thumb for HVAC systems. Typically, a ton of cooling capacity corresponds to approximately 400 cubic feet per minute (cfm) of airflow. This guideline helps ensure that the system operates efficiently and effectively to meet the cooling or heating demands of a space.

For a 7.5 ton heat pump, the airflow can be calculated by multiplying the tonnage by the airflow per ton. Applying this guideline:

7.5 tons x 400 cfm/ton = 3000 cfm

This calculation illustrates that the ideal airflow for a 7.5 ton heat pump is indeed 3000 cfm. This airflow level helps maintain optimal system performance, ensuring comfort and efficiency.

Other choices reflect airflow values that would either be insufficient or excessive for a system of this capacity. A higher or lower airflow wouldn't provide the necessary capacity for effective heating or cooling, which is critical in HVAC design for both comfort and energy efficiency. Thus, the correct answer of 3000 cfm aligns perfectly with standard industry practices for sizing and airflow requirements.