How does the indoor fan operate in a heat pump system?

In a heat pump system, the indoor fan operates at the same speed for both heating and cooling modes to ensure a consistent and efficient air distribution regardless of the mode being used. This design is intentional because it helps maintain a balance in airflow, promoting comfort throughout the space. When the heat pump is in operation, whether heating or cooling, the objective is to circulate air effectively to evenly distribute the conditioned air.

Choosing a constant speed for the fan allows the system to maintain stable airflow conditions and enhances the system's reliability. It helps avoid fluctuations that could lead to drafts or uneven temperature felt by occupants, which is especially important in applications where comfort is a primary concern.

Variations in fan speed can lead to inefficiencies or comfort issues, as the system could either be over-circulating or under-circulating air. Thus, operating at a consistent speed provides an optimal solution for effective performance in both winter and summer modes.