True or False: There should never be frost on a heat pump in cooling mode.

A heat pump in cooling mode is designed to remove heat from the indoor environment and release it outside, functioning similarly to an air conditioning unit. Under normal operating conditions, there should not be frost forming on the heat pump coils. The reason is that the system is intended to operate in a way that maintains the coil temperatures above freezing, ensuring efficient heat exchange.

Frost can occur if there are issues such as poor airflow, refrigerant undercharge, or if the outdoor temperature is too low for the system to operate effectively. These situations could lead to a drop in coil temperatures and result in the formation of frost, which is undesirable because it hampers the heat exchange process and can ultimately affect the system's performance. Therefore, the statement that there should never be frost on a heat pump in cooling mode is accurate, as it indicates proper functioning of the system under ideal conditions.