What is a common reason why HVAC systems might lose efficiency over time?

A common reason HVAC systems lose efficiency over time is due to infrequent servicing and maintenance. Regular maintenance is essential for keeping HVAC systems running optimally. When systems are not serviced periodically, issues such as dirty filters, blocked ducts, or worn-out components can accumulate, leading to decreased performance. Dust and debris can restrict airflow, while components like coils can become less effective due to grime buildup. Regular maintenance helps identify and address these issues before they escalate, ensuring the system remains efficient and avoids unexpected breakdowns.

Infrequent servicing means that critical components like belts, bearings, and refrigerant levels might not be checked regularly, compromising the efficiency of the entire system. Furthermore, maintenance helps in optimizing system settings, which can adapt the operation according to changing demands, thus maintaining energy efficiency over time.

While other factors like lack of outdoor air, stable energy prices, and high humidity levels can impact HVAC performance, they do not universally relate to efficiency loss over time in the same direct manner as neglecting necessary maintenance.