What is stated about frost on the outdoor heat pump coil in cooling mode?

Frost on the outdoor heat pump coil during cooling mode is a phenomenon that can occur under certain circumstances. While operational conditions can vary, frost tends to develop when the temperature and humidity levels are conducive to its formation, particularly if the coil temperature drops below the dew point. Given this, it is inaccurate to state that there will never be frost on the coil since certain environmental conditions consistently lead to its formation.

The correct understanding is that frost can indeed form depending on various environmental factors, including temperature and humidity. Thus, the perspective that frost will never occur oversimplifies the complexities of heat pump operation, especially in cooling mode. Monitoring and addressing frost is an essential part of maintaining efficient heat pump operation. Therefore, stating that frost will never be present overlooks these operational realities.