What action can improve system performance if the indoor coil temperature split is unfavorable?

Increasing the indoor fan speed is an effective action to improve system performance when the indoor coil temperature split is unfavorable. An unfavorable temperature split indicates that the temperature difference between the return air entering the indoor coil and the supply air exiting the coil is either too small or too large, which can lead to inefficiencies in heating or cooling.

By increasing the indoor fan speed, you can enhance air circulation across the indoor coil. This increased airflow helps to maximize the heat exchange process, leading to more effective cooling or heating of the indoor space. Improved airflow can reduce the likelihood of issues such as coil frost or inadequate temperature distribution, thereby optimizing the overall performance of the heat pump system.

In contrast, switching to another product does not directly address the specific performance issues at hand and may not resolve the unfavorable temperature split. Increasing refrigerant levels can be problematic if the system is already fully charged, as overcharging can cause additional efficiency issues. Replacing the compressor is a significant and often costly step that may not be necessary unless the compressor itself is malfunctioning, rather than simply addressing airflow concerns related to fan speed.