Compressors in HVAC systems are sized based on which requirement?

The sizing of compressors in HVAC systems is primarily based on CFM, which stands for Cubic Feet per Minute. This measurement indicates the volume of air that the compressor can circulate within a minute.

When designing an HVAC system, understanding the air flow requirements is crucial to ensure the system can effectively meet the heating or cooling demands of the space. CFM is a key factor because it helps determine how much air must be moved to achieve desired temperature and airflow levels in a building. Proper CFM calculations ensure that the compressor operates efficiently, maintains comfort levels, and avoids issues such as short cycling or excessive energy consumption.

The other options, while related to various measurements in building and equipment performance, do not pertain to compressor sizing in HVAC systems. MPH (Miles Per Hour) relates to speed, GPM (Gallons Per Minute) is used for measuring fluid flow in plumbing or liquid cooling systems, and KPH (Kilometers Per Hour) is another speed measurement. None of these are directly applicable to the air handling requirements specific to HVAC compressors.