When measuring the area of a surface for HVAC purposes, which unit is typically used?

In HVAC applications, when measuring the area of a surface, square feet is the appropriate unit because it expresses a two-dimensional space. This is particularly relevant when determining the size of ducts, the surface area of coils, and the sizing of equipment to ensure proper airflow and heat exchange. Understanding the area in square feet allows technicians to effectively calculate airflow rates, assess heat transfer requirements, and evaluate system efficiency.

Cubic inches and liters are units of volume, which wouldn't be suitable for measuring surface area. Pounds measures weight, which is also not applicable in this context. Thus, square feet is the standardized unit that aligns with the needs of HVAC system calculations and assessments.