What maintenance task is essential to ensure optimal heat pump performance?

Cleaning or replacing the air filter regularly is crucial for maintaining optimal heat pump performance. The air filter plays a significant role in the system's efficiency. When a filter becomes clogged with dirt and debris, it restricts airflow, causing the heat pump to work harder to circulate air. This increased workload can lead to higher energy consumption and strain on the system, potentially resulting in more frequent breakdowns and a shorter lifespan for the heat pump.

Regularly maintaining the air filter helps to ensure that the heat pump operates efficiently, maintaining proper airflow and reducing the risk of overheating or other mechanical issues. A clean filter also contributes to improved indoor air quality by trapping particulates that can be harmful to health.

Other options, while potentially beneficial in certain contexts, do not address routine maintenance as effectively. For instance, changing ductwork may not be feasible on an annual basis and could be unnecessary unless there are signs of damage or air leaks. Increasing refrigerant levels should only be done if a problem is detected, not routinely as part of an annual maintenance schedule, as this can indicate a leak if levels are low. Similarly, upgrading the thermostat may have its advantages, but it is not a regular maintenance task and doesn’t have the immediate impact on the heat pump’s operation that