What can lead to a decrease in heat pump efficiency over time?

A decrease in heat pump efficiency over time can often be attributed to improper installation or a lack of routine maintenance. When a heat pump is not installed correctly, it can lead to several issues, such as insufficient airflow, refrigerant leaks, or incorrect sizing, all of which can hinder the system's ability to heat or cool effectively. Additionally, without regular maintenance, components may wear out, dirt and debris can accumulate, and the system can become less efficient. Routine maintenance helps to identify and resolve these issues before they significantly impact performance, so neglecting this aspect can exacerbate efficiency loss over time.

In contrast, regular use and maintenance actually help maintain efficiency, and using the latest technology typically enhances performance levels. An increase in ambient temperatures can affect the performance of a heat pump but does not directly lead to a gradual decrease in efficiency over time as presented in this context.