Which of the following is NOT a part of regular heat pump maintenance?

Ignoring system performance is not part of regular heat pump maintenance because it directly contradicts the goals of maintenance, which are to ensure the system operates efficiently and effectively. Regular maintenance includes activities that monitor and enhance the heat pump's performance. By ignoring system performance, potential issues may be overlooked, leading to decreased efficiency, increased energy consumption, and potential system failure.

In contrast, cleaning the outdoor unit, replacing the air filter, and checking the ductwork for leaks are all essential components of maintenance. Cleaning the outdoor unit ensures that debris and obstructions do not hinder airflow or heat exchange, which is crucial for efficient operation. Replacing the air filter helps to maintain good indoor air quality and prevents dust and dirt from accumulating in the system, which can also impede airflow. Checking the ductwork for leaks is vital because any leaks can significantly reduce the system's efficiency, leading to higher energy costs and less effective heating or cooling. Each of these actions helps to improve and maintain the overall performance of the heat pump system.