What causes short cycling in an HVAC system?

Short cycling in an HVAC system refers to the frequent on-off cycling of the unit, which can lead to inefficient operation and increased wear and tear. The primary factors contributing to short cycling include issues related to the thermostat settings, oversized units for the space, or restricted airflow that might prevent the system from operating effectively.

When a unit is oversized, it heats or cools a space too quickly. As a result, the thermostat signals the system to shut off prematurely before it can complete a full heating or cooling cycle. This constant starting and stopping can cause stress on the system's components and lead to frequent breakdowns.

Thermostat issues can also result in inaccurate temperature readings, causing the system to deactivate too soon or too late. Additionally, restricted airflow due to dirty filters, blocked ducts, or closed vents can lead to overheating or freezing in the unit, triggering safety mechanisms that shut down the HVAC system to prevent damage.

Recognizing these factors is essential for maintaining system efficiency and longevity, as well as ensuring the comfort of the spaces served by the HVAC system.