What might cause increased noise levels in an HVAC system?

Increased noise levels in an HVAC system can often be attributed to loose components or airflow obstructions. When parts of the system, such as screws, bolts, or ductwork, are not properly secured, they can vibrate and produce additional noise during operation. Similarly, airflow obstructions, which may include dirty filters, blocked ducts, or debris within the system, can lead to increased turbulence and disturbances in airflow. This turbulence can create a variety of sounds, from rattling to whistling, ultimately leading to a noisier operation of the HVAC system.

While other factors can contribute to HVAC system noise, such as a malfunctioning thermostat or issues related to refrigerant levels, they typically do not result in noise as directly or significantly as loose components or airflow obstructions do. Circuit overload might cause operational issues but is less likely to be the primary cause of increased noise levels in HVAC systems.