What is the recommended CFM across the evaporator coil of a heat pump?

The recommended range for cubic feet per minute (CFM) across the evaporator coil of a heat pump is 400 to 450 CFM. This range is crucial for optimal heat exchange, which allows the system to operate efficiently.

When the airflow is within this range, it ensures that the refrigerant has sufficient contact time with the air, promoting effective heat absorption. This balance contributes to the heat pump's overall performance, helping maintain comfortable indoor temperatures while maximizing energy efficiency.

Operating outside of this range can lead to inefficiencies, such as reduced heat transfer, which can cause the system to work harder and consume more energy, potentially leading to increased wear and tear. Thus, adhering to the 400 to 450 CFM recommendation supports the longevity of the system and improves overall comfort levels in conditioned spaces.