What does "over-sizing" mean in the context of heat pump installations?

Over-sizing in the context of heat pump installations refers specifically to choosing a heat pump that is too large for the designated space. This practice often results from miscalculating the heating or cooling load required for a specific area. When a heat pump is over-sized, it can lead to several operational issues, such as short cycling, where the unit turns on and off frequently. This not only reduces the equipment's efficiency but can also lead to increased wear and tear, resulting in higher maintenance costs and a shorter lifespan for the system. Additionally, an over-sized heat pump may not dehumidify the space effectively, leading to discomfort for occupants.

In contrast, installing multiple heat pumps for a single space might be necessary for larger areas or specific zoning needs but does not specifically define over-sizing. Utilization of larger ducts pertains to air distribution techniques that can improve airflow but does not inherently suggest that the heat pump itself is oversized. Higher capacity units can be chosen for efficiency, but selecting a unit that exceeds the requirements of the space is what constitutes over-sizing.