Which of the following maintenance activities can help extend the life of an air conditioning system?

Regular filter changes are crucial for maintaining an air conditioning system's efficiency and longevity. Air filters trap dust, dirt, and other particles that can accumulate in the system. When filters become clogged, they restrict airflow, making the system work harder to achieve the desired temperature. This increased workload can lead to overheating and higher energy consumption, ultimately resulting in more significant wear and tear on the unit. By routinely changing or cleaning filters, typically every one to three months, depending on the usage and the type of filter, you ensure that the system runs smoothly, enhancing its performance and extending its operational life.

In contrast, replacing the thermostat annually may not have a direct impact on extending the entire system's life, as thermostats do not wear out quickly and are generally reliable for many years. Using the system without any maintenance can lead to a variety of problems, including reduced efficiency and potential breakdowns due to dust accumulation and component wear. Similarly, running the system continuously without breaks can cause strain, resulting in overheating and failure of critical components over time. Regular filter maintenance is the most direct and effective way to improve the system's lifespan.